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An API (Application Programming Interface) enables two-way communication between software applications driven by requests. A webhook is a lightweight API that powers one-way data sharing triggered by events. Together, they enable applications to share data and functionality, and turn the web into something greater than the sum of its parts. ProgrammableWeb provides a database of over 23,000 APIs that deal with everything from global epidemiological data to dad jokes. Each API is a blank canvas waiting for developers to tie it into other applications.