Intranets, document management, team collaboration portals, external customer portals, workflow scenarios, search, project management repositories and public internet sites for large corporations.
A sample of the types of companies and organizations using SharePoint would include financial, insurance, manufacturing, consulting and some government entities. Since the majority of the business solutions SharePoint are used for are needed by larger organizations (this may not apply to Office 365 users), there is usually a better chance you will get the better pay, benefits and career options that also come along with larger companies and organizations as well. In addition to this, SharePoint has grown in use far quicker than the amount of skilled labor available needed to create and support advanced solutions built upon it. Most rapidly growing technologies have this trait however.