A Blockchain API is a set of protocols and tools that allows developers to interact with blockchain networks. It enables software applications to communicate with blockchain systems, facilitating actions like creating transactions, fetching blockchain data, and managing digital assets.

These APIs simplify the integration of blockchain features into applications by providing predefined functions. For example, a payment app can use blockchain APIs to enable users to make cryptocurrency transactions without needing deep knowledge of blockchain technology.

There are different types of blockchain APIs, such as those for data retrieval, transactions, and smart contracts. By using these APIs, developers can build and enhance user experiences, ensuring that applications are secure and efficient.

Overall, Blockchain APIs play a crucial role in making blockchain technology more accessible and usable for various applications, promoting innovation and growth within the industry.