Replit is a browser-based integrated development environment and platform that enables users to write, run, and deploy code instantly across many programming languages. It combines a collaborative cloud editor, instant hosting of projects (Repls), and AI-powered coding assistants to accelerate development, debugging, and prototyping. Replit also provides classroom and team features for education and group work, a built-in key-value database and secrets manager, mobile apps for coding on the go, and integrations for importing/exporting projects. Its value lies in removing environment setup friction, enabling real-time collaboration, and integrating AI tools to speed up coding and project delivery.