Fidelity National Information Services, Inc. (or FIS) is an American company on the Fortune 500 list which offers an array of financial products & services including; financial software development & support, business process outsourcing for back office banking operations & contact centers, merchant support via POS technology & digital channels for local small businesses to global enterprises, facilitation of global payment processing, B2C & B2B eCommerce Solutions, and more.

Headquartered in Jacksonville, Florida, FIS employs approximately 55,000 people worldwide. After finalizing FIS' most recent deal – as well as the industry's largest-ever (by far) – to acquire Worldpay for $35 billion in Q3 of 2019, FIS became the largest processing and payments company in the world.

FIS is most known for its development of Financial Technology, or FinTech, and as of Q2 2020 it offers its FinTech Solutions in three primary segments; Merchant Solutions, Banking Solutions, and Capital Market Solutions.

Annually, FIS facilitates the movement of roughly $9 trillion through the processing of approximately 75 billion transactions in service to more than 20,000 clients around the globe.

According to en.wikipedia