What is an api ?




Application Programming Interface
?but whaat does that mean

Wether app example

for a weather app, you don't want to build weather station all around the globe by yourself. so you go to someone who has those Station and can give you the data when you need it .
if data is provided like that , we call it an api

Retrofit 

for android , retrofit as a very popular library to communicate with an api , a common alternative is volley

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