AI Words
60 words that keep coming up in AI news and lessons — each with a one-line meaning, a plain explanation and an analogy.
- Beginnerfor everyone
- Intermediateone layer deeper
- Advancedwith the technical terms
Basics
The words every AI conversation starts with
9 words- AI
Artificial intelligence
Depth: BeginnerTechnology that lets computers do things that used to need a human mind.
- ML
Machine learning
Depth: BeginnerBuilding AI by letting the computer learn rules from examples instead of being told.
Deep learning
Depth: IntermediateMachine learning with neural networks stacked many layers deep.
- artificial neural network · ANN · neural net
Neural network
Depth: IntermediateLayers of simple multiply-and-add units wired together: the backbone of modern AI.
- AI model
Model
Depth: BeginnerThe trained core of an AI: a big bundle of numbers that turns an input into an answer.
- model training
Training
Depth: BeginnerShowing a model examples and nudging its numbers each time it gets one wrong.
- model inference · running a model
Inference
Depth: IntermediateRunning a finished, trained model to get an answer out of it.
- training data
Dataset
Depth: BeginnerA collection of examples gathered to teach or test an AI.
- weights · parameter count
Parameter
Depth: IntermediateOne of the many numbers inside a model that get tuned during training.
Language models
How chatbots read and write
15 words- language model
Large language model (LLM)
Depth: BeginnerA big AI model trained on huge amounts of text that writes by picking the next token.
Token
Depth: BeginnerThe small piece of text an AI reads and writes, one at a time.
- tokenization · BPE · byte pair encoding
Tokenizer
Depth: IntermediateThe tool that chops text into tokens and gives each piece an ID number.
- next-word prediction · autoregressive generation
Next-token prediction
Depth: BeginnerGuessing the one token that comes next, based on all the text so far.
- context length · context size
Context window
Depth: BeginnerHow much text an AI can read and keep in view at once, counted in tokens.
- sampling temperature
Temperature
Depth: IntermediateA setting that controls how adventurous an AI is when picking the next token.
- prompting · prompt engineering
Prompt
Depth: BeginnerWhatever you give an AI to work with: your question, instructions and examples.
- AI hallucination · confabulation
Hallucination
Depth: BeginnerWhen an AI confidently says something false or made up as if it were true.
- transformer model · Attention Is All You Need
Transformer
Depth: IntermediateThe neural network design behind most of today's large language models.
- self-attention · attention mechanism
Attention
Depth: AdvancedThe calculation that decides how much each token focuses on every other token.
- vector · embedding vector · vector embedding
Embedding
Depth: IntermediateA list of numbers that captures the meaning of a word, a sentence or an image.
- base model
Pretraining
Depth: IntermediateThe first, giant training stage where a model learns broadly from huge amounts of data.
Fine-tuning
Depth: IntermediateExtra training that shapes an already-trained model for a specific job or style.
- reinforcement learning from human feedback · human feedback training
RLHF
Depth: IntermediateTraining an AI on people's choices about which of two answers is better.
- GenAI
Generative AI
Depth: BeginnerAI that creates new things: text, images, audio or video.
What AI can do
What today's AI does, and how
12 words- multimodal AI · multimodal model
Multimodal
Depth: BeginnerDescribes an AI that handles more than text: images, sound and video too.
- thinking model · reasoning LLM
Reasoning model
Depth: IntermediateAn AI trained to work through a problem step by step before it answers.
- CoT · chain-of-thought prompting · step-by-step reasoning
Chain of thought
Depth: IntermediateGetting an AI to write out its steps one by one before it gives the answer.
- function calling · tool calling
Tool use
Depth: IntermediateAn AI calling outside tools, like a calculator, search or code, to get things right.
- agent · agentic AI · autonomous agent
AI agent
Depth: BeginnerAn AI that takes a goal and works through many steps on its own, using tools.
- Model Context Protocol
MCP
Depth: AdvancedAn open standard for plugging AI apps into tools and data in one shared way.
- retrieval-augmented generation
RAG
Depth: IntermediateHaving an AI look up relevant documents first, then answer based on them.
- system message · system instructions · custom instructions
System prompt
Depth: IntermediateHidden instructions an AI app gives the model before your conversation starts.
Vibe coding
Depth: BeginnerBuilding software by telling an AI what you want instead of writing the code yourself.
- diffusion · denoising diffusion
Diffusion model
Depth: IntermediateAn AI that makes a picture by starting from random noise and cleaning it up step by step.
- speech-to-text · STT · ASR
Speech recognition
Depth: BeginnerAI that listens to spoken words and turns them into written text.
- CV · image recognition · machine vision
Computer vision
Depth: BeginnerThe field of AI that lets computers look at images and work out what's in them.
Models & machines
Words from building and running models
8 words- open weights · open model · open-weights model
Open-weight model
Depth: IntermediateA model whose trained numbers (weights) are published so anyone can download them.
- eval · evaluation · leaderboard
Benchmark
Depth: IntermediateA shared test that gives AI models the same questions so their scores can be compared.
- neural scaling laws
Scaling laws
Depth: AdvancedThe observation that AI gets predictably better as models, data and compute grow.
- knowledge distillation · model distillation
Distillation
Depth: AdvancedTraining a small model to copy what a big model has learned.
- quantisation · 4-bit model · model compression
Quantization
Depth: AdvancedStoring a model's numbers with less precision so it takes up less memory.
- edge AI · local AI · on-device model
On-device AI
Depth: BeginnerAI that runs right on your phone or laptop instead of on a faraway server.
- graphics card · graphics processing unit · AI chip
GPU
Depth: BeginnerA chip that does huge numbers of simple calculations at once: the workhorse of AI.
- data centre · server farm
Data center
Depth: BeginnerA building packed with computers where AI is trained and run.
AI and society
Risks and rules worth knowing
9 words- safe AI · AI risk
AI safety
Depth: BeginnerThe research and safeguards that aim to keep AI from causing harm.
- AI alignment · value alignment
Alignment
Depth: IntermediateGetting an AI to act the way people intend, in line with human values.
- jailbreaking · AI jailbreak
Jailbreak
Depth: IntermediateWording a request cleverly to trick an AI into breaking its own safety rules.
- indirect prompt injection · injection attack
Prompt injection
Depth: IntermediateHiding instructions in content an AI reads, to make it do something it shouldn't.
- AI-generated fake · voice clone
Deepfake
Depth: BeginnerA fake made with AI that convincingly copies a real person's face or voice.
- AI bias · algorithmic bias
Bias
Depth: BeginnerWhen an AI's answers lean one way because the data it learned from was lopsided.
- watermarking · SynthID · C2PA
AI watermark
Depth: IntermediateA hidden mark placed in AI-made content so it can later be recognised as AI-made.
- artificial general intelligence · general AI · strong AI
AGI
Depth: BeginnerAI that could handle almost any thinking task a person can, not just one or two.
- AI law · EU AI Act · AI Basic Act
AI regulation
Depth: BeginnerThe laws and rules governments set for how AI is built and used.
Words from history
Words from the road to today's AI
7 words- imitation game
Turing test
Depth: BeginnerA test of whether you can tell a machine from a person just by chatting with them.
- Mark I Perceptron
Perceptron
Depth: IntermediateA 1958 artificial neuron that adjusts its own weights when it gets an example wrong.
- backprop · backward propagation of errors
Backpropagation
Depth: AdvancedSending the error backward through a neural network to work out how to fix each weight.
AI winter
Depth: BeginnerA stretch of time when hopes for AI collapsed and funding and interest dried up.
- ILSVRC · ImageNet challenge
ImageNet
Depth: IntermediateA huge set of over 14 million labeled photos, and the yearly contest built around it.
- RL
Reinforcement learning
Depth: IntermediateLearning by trying things, getting rewards, and doing more of what earns them.
Supervised learning
Depth: IntermediateMachine learning from examples that come paired with the right answers.