@Sunil92 ...you don't get API. That belongs to the provider. They only give you API access.
Anyways, simply put: an API is a way where the website/organization gives out and receives(in different protocols) info in an easy to access manner from/by developers. I.e in a format that is structured and easily decoded by the developer's script/program. The developers then code a program that harvests the data and makes use of it.
Well known is the Twitter API: https://dev.twitter.com/docs/twitter...-and-snowflake
Check that website's menu and poke around, you'll probably find mention of an API somewhere.
If not, they just don't want to share that info with developers or they just don't have the means/time to code an API.
Try googling 'website name API'. It'll most probably yield something if it has an API.
As for captcha, it's meant to dissuade automatic, non-human access. Re-captcha is owned by Google who are pretty good at this stuff. Some researchers have made an algorithm with a high solve-rate(even your selling your organs will probably not get you that) and of course after it comes out, Google patches their captchas generator.
So, no. You can't bypass captchas.