What is Gemini? — AI Glossary

What it is: Gemini is Google’s AI assistant and the family of AI models that powers it. It’s one of the three biggest AI chatbots, alongside ChatGPT and Claude.
Who it’s for: Beginners who use Google products (Gmail, Docs, Drive) and want to know what “Gemini” means.
Best if: You want a plain-English primer before turning on Gemini in your Google account.
Skip if: You already use Gemini daily — go to our How to Use Gemini guide.

Gemini is the AI assistant made by Google. It can write, summarize, answer questions, generate images, analyze documents, and help inside Gmail, Google Docs, Sheets, Slides, and Drive. The same name — Gemini — refers to both the consumer chatbot at gemini.google.com and the underlying family of AI models (Gemini Flash, Gemini Pro, Gemini Ultra, plus generation versions like Gemini 2, Gemini 3) that power it.

Google launched Gemini on December 6, 2023, replacing its previous AI assistant called Bard. By 2026 Gemini is built into nearly every major Google product, comes pre-installed on most Android phones, and is the AI most likely to be the default for anyone already living in the Google ecosystem.

Table of Contents

What makes Gemini different

It’s natively multimodal. Gemini was designed from day one to handle text, images, audio, and video together — not bolted-on later. See Text-to-Image and Text-to-Video.
Long context window. Gemini Pro and Flash support extremely long inputs — up to one million tokens on Pro — useful for analyzing book-length documents or long codebases.
Deep integration with Google Workspace. Gemini can read your Gmail threads, summarize Google Docs, build sheets, and create Slides directly inside those products.
Deep Research. A feature that runs autonomously across the web for 5-15 minutes and produces a structured research report.
Gems. Custom Gemini assistants you can save and reuse, similar to OpenAI’s Custom GPTs. See our Gemini Gems glossary entry.

How to use Gemini

Free: Go to gemini.google.com with any Google account.
Gemini Advanced ($20/month): Part of the Google One AI Premium plan. Unlocks Pro and the highest-capability models, longer context, Deep Research, and Gemini features inside Workspace. See our Gemini Advanced review.
Inside Google Workspace: Gemini for Workspace adds AI directly to Gmail, Docs, Sheets, Slides, Drive, and Meet. See Gemini in Google Workspace.
Mobile: Gemini is the default AI assistant on Android and is available as an iOS app.
For developers: The Gemini API is accessible through Google AI Studio and Google Cloud’s Vertex AI.

What Gemini is not

Gemini is not the same product as Google Search, though both can answer questions. Google Search retrieves and ranks existing web pages; Gemini generates new responses based on patterns it learned during training. Gemini can also hallucinate — produce confident-sounding wrong answers — so verify anything important against authoritative sources. Gemini is also not Google’s only AI offering: Gemma is Google’s family of open-source models, and DeepMind publishes research that often becomes Gemini features later.

Learn more: How to Use Google Gemini: Complete Beginner’s Guide, What’s New in Gemini 2026, Gemini vs ChatGPT for Google Users, ChatGPT vs Claude vs Gemini, Google AI Studio. Get every Gemini update as it ships in our free daily Beginners in AI newsletter.

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