What is API's? API's stands for application programming interface. They are interfaces for code or computers to talk to one another. For example, we can use a Facebook account to login to Instagram. When we connect these two apps, Instagrams will link to and access your Facebook data. When you upload photos on Instagram, it will be automatically uploaded on Facebook, too. We also use a lot of Web API's every day. Web API's generally to communicate via HTTP. For example, we may ask Yelp API's to recommend 10 nearby Sushi restaurants in a certain zip code. Data Formats There are two main formats that web API is responded with: XML and JSON . When we use the internet, we make an HTTP request and get HTML back. API's don't respond with HTML because HTML contains information about the structure of a page. API's respond with data, not structure. XML XML stands for Extended Markup Language. It is syntactically similar to HTML, but it...