Monorepos are codebases containing multiple projects, often using different frameworks, in a single unified code repository, offering advantages such as easier updates across packages, collaboration and debugging, local development, and faster builds with remote caching. Turborepo is a high-performance build system designed after massive software engineering organizations' workflows to abstract complex configuration needed for monorepos, providing fast incremental builds with zero-configuration remote caching. By adopting Turborepo, teams can improve developer productivity, reduce time spent on shipping code, and increase consistency across products and features.