API stands for Application Programming Interface. According to Google, API is a set of functions and procedures that allow the creation of applications which access the features or data of an operating system, application, or other service. In simple terms, it means a specification of remote calls for a program to interact with another software. API calls are required to retrieve data from the sources, such that you do not have to manually key in the data from the source to update your investment tracker. The data is being refreshed via the feed, freeing up your time for analysis instead of doing data entry.
In this article, I will share the basics of setting up simple API calls from GoogleFinance, IEX and Alpha Vantage.