What are crypto APIs?

Could you elaborate on the concept of crypto APIs? I'm curious to understand how they fit into the broader landscape of cryptocurrency and finance. Are they simply tools for developers to build applications or do they serve a more complex role? Do crypto APIs enable access to specific blockchain data or functionalities? Are there any security considerations one should be aware of when utilizing crypto APIs? I'm interested in understanding the potential benefits and limitations of using crypto APIs for both individuals and enterprises in the cryptocurrency space.