Accounting

A stock is a type of security that an ordinary person buys of a company to obtain partial ownership of said company. 

In other words, one gives money to a company which needs liquidity, and in return the company pays back the individual with a share, making them a shareholder of the company. 

Simple was one of many fintech startups that tried to add fancy tech and smartphone app sprinkles to your vanilla checking account. They were acquired by the big European-based bank BBVA in 2014, but never really took off. It looks like they are making another push by adding high-yield “Protected Goals” accounts that earn 2.02% APY (as of 7/10/19) and offering additional $250 bonus if you deposit $10,000 and meet certain requirements and deadline dates: