Cursor is a fork of VS Code customized for AI. It pioneered Tab-to-Complete (Copilot++) and Composer (Multi-file edits). In 2025, it is the leading "AI Native" editor.
A floating window that can edit multiple files simultaneously. "Add a
field to the User model and update all call sites."
Cursor locally indexes your code (embeddings) so the LLM knows about function definitions in other files without you opening them.