What Is ChatGPT? (The Complete 2026 Guide)
Updated: 7 hours ago
New in 2026: ChatGPT Voice Mode and GPT-Live, ChatGPT Agent Mode, ChatGPT vs Grok build on everything explained in this guide.
ChatGPT is an AI chatbot from OpenAI that understands questions in plain English and replies in natural language. You can use it to answer questions, write and edit text, summarise documents, generate images and help with code. It has a free plan and paid plans, and it works in a browser and in mobile apps.
ChatGPT is a conversational AI assistant made by OpenAI. You type or speak a request, and it replies in everyday language. This guide explains what ChatGPT is, how it works, what it can do, what it costs and how to use it safely.
What Does ChatGPT Stand For?
ChatGPT stands for Chat Generative Pre-trained Transformer. "Chat" is the conversation format. "GPT" names the type of language model behind it, which was trained on very large amounts of text before being fine-tuned to follow instructions. For a longer explanation, read What does ChatGPT stand for?.
Who Made ChatGPT?
OpenAI, an AI research company, launched ChatGPT in November 2022. It is independent of this website. WhatIsChatGPT is an educational site and is not affiliated with OpenAI. You can read more in What kind of company is ChatGPT?.
How Does ChatGPT Work?
ChatGPT is built on a large language model. The model learns patterns in text, then predicts the most useful next words one after another to build a reply. It does not look answers up in a database by default, which is why it can sometimes sound confident and still be wrong. Newer versions can also search the web, read files and work with images and voice. Our guide How ChatGPT Works goes deeper.
What Can ChatGPT Do?
People use ChatGPT for a wide range of everyday jobs:
Answering questions and explaining difficult topics in plain English
Drafting and editing emails, essays, reports and social posts
Summarising long documents, PDFs and articles
Translating between languages
Helping to write, explain and debug code
Brainstorming ideas, plans and names
Creating and editing images
Voice conversations on the mobile app
See the full list in What is ChatGPT used for? and learn about image creation in the ChatGPT Image Generator guide.
Is ChatGPT Free?
Yes, ChatGPT has a free plan with unlimited text chats on a lighter model, plus limited use of extra features. Paid plans add stronger models, higher limits and more tools. Plus costs around $20 per month at the time of writing. Check OpenAI's pricing page for current plans and prices, and read Is ChatGPT Free? Free vs Plus vs Pro Explained for a plain comparison.
How Do You Use ChatGPT as a Beginner?
Getting started takes a few minutes:
Go to chatgpt.com or install the official ChatGPT app.
Create a free account with your email, Google or Apple account.
Type a clear request in the message box, for example: "Explain how a mortgage works in simple terms."
Read the answer and ask follow-up questions to refine it.
Check anything important against a trusted source.
For a longer walkthrough, see How to Use ChatGPT: The Complete Beginner's Guide.
Is ChatGPT Safe to Use?
ChatGPT is safe for everyday questions, but do not share passwords, bank details or other sensitive personal information in a chat. Conversations may be stored and, depending on your settings, used to improve the service. You can change data controls in your account settings. Our plain-English privacy guide explains the options.
What Are the Limitations of ChatGPT?
It can produce answers that sound right but are wrong, so verify important facts.
It may not know very recent events unless web search is on.
It can reflect biases found in its training data.
It is not a replacement for professional medical, legal or financial advice.
How accurate is ChatGPT's information? looks at this in more detail.
How Is ChatGPT Different From Google?
Google is a search engine that points you to web pages. ChatGPT writes a direct answer and can hold a conversation, but it can be wrong and does not always show sources. Many people use both. Read the best AI chatbots comparison, or compare directly in ChatGPT vs Gemini and ChatGPT vs Claude.
What else should I read about this topic?
Frequently Asked Questions About ChatGPT
What is ChatGPT in simple terms?
ChatGPT is an AI chatbot from OpenAI. You ask it something in normal language and it replies like a helpful assistant.
Is ChatGPT free to use?
Yes. There is a free plan, and paid plans add stronger models and higher limits.
Who owns ChatGPT?
ChatGPT is made and owned by OpenAI.
Is ChatGPT the same as the OpenAI website?
No. OpenAI is the company. ChatGPT is one of its products, available at chatgpt.com and in mobile apps.
Can ChatGPT access the internet?
Newer versions can search the web when the feature is available to your account, but it is not always on.
Is ChatGPT always right?
No. It can make mistakes, so check important facts with reliable sources.
Do I need an account to use ChatGPT?
Some features work without logging in, but an account unlocks saved chats and more tools.
Can children use ChatGPT?
Younger users need adult supervision and must meet OpenAI's age rules. Read our guide for parents before allowing it.
The Bottom Line
ChatGPT is a free-to-start AI assistant that helps with writing, learning, planning and coding. Use it as a helpful first draft or tutor, check what matters, and keep personal details out of your chats. Explore more ChatGPT guides on whatischatgpt.co.uk.
