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Web Api - what they are and where it is use?

I would like to learn Web API. Why is it so a popular skill and in demand? Where is it use by businesses online.
Where would I start? Please send links/resources
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What's difference between SDK and API?
I came across Smarty Street that validates addresses. I think once you get an id you should be able to use the library for your app. Is this a Web API? But it doesn't use HTTP Get? Thanks for your replies on this in advance.
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Hi,

API =  application program interface
API is an interface that allows software programs to interact / communicate with each other.

SDK = software developer's kit
This is set of programs used by a programmer to write application.

SDK  is like a complete set of APIs, that also include tools, documentation, samples this is a kit.