DocuSign (NASDAQ;DOCU) may be unfamiliar to you. You might have used the platform to sign mortgage documents or other agreements. This Fool Live video by Brian Withers, Fool.com contributor, focuses on the most important aspect of DocuSign's business.Brian Withers: Many people say, "Oh yes, DocuSign." It was used for my mortgage paperwork, signing documents that I had, and other things. You know what? DocuSign almost doesn't care if you are a customer. Let me tell why. Here is their revenue for the past five quarters. The blue bar is 88% of their total revenue. It's larger than the dark blue bar. This is not only their current business but also their future business. Take a look at the total customers. There are almost one million customers, 988,000 of them. Surprisingly, only 14% are commercial enterprise customers, yet they account for 88% of the company's revenue. Take a look at the direction DocuSign is heading. Everyone knows DocuSign's e-signature product. There are only a few dots in this $25 billion market. Prepare, act, then manage: This is about managing contracts from start to finish and executing them within a corporate environment. DocuSign's second act is all about the corporate customer. It digitizes and makes contracts more like software than a paper piece. It's all about corporate clients. Why is this so important? Look at this: Nearly every department in the enterprise has an agreement as part their doing business. Consider all the HR agreements you signed when joining the company. Finance includes sales tax, procurement, and other related matters. Even facilities that set up HVAC maintenance or lawn services, IT operations are essential. Cloud services can be used to support their services. All of these things are subject to agreements and contracts. DocuSign is a specialist in this area.