answer the questions please and please write the source under each answer

Question 1
Define API and explain how it works.
Question 2
An API is _______________.
Question 3
Think of an university enterprise and select three technical challenges to integration and explain how they manifest themselves in that enterprise.
Question 4
A company has multiple databases and instead of replacing them, they design a global view over all the databases so that users can access them as if they were one single database. This is called __________________.
Question 5
Contrast synchronous and asynchronous communication.
Question 6
A protocol is best described as?
 
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