Lexical is a Facebook‑built, framework‑agnostic rich‑text editor core that delivers a reliable, accessible, type‑safe foundation with plugin extensibility, undo/redo, collaborative editing, and rich‑node support for formats such as tables, images, and Markdown. It is geared toward developers who want to embed or build powerful, production‑ready editors—like collaborative document or annotation tools—using React (or any UI framework) with minimal boilerplate and full‑featured API access.