When you search for your website, does it appear as "Mobile Friendly"?
Mobile Friendly, or "Responsive websites", are designed to be accessible from any device. Small phone displays, tablets, laptops and desktops. The site adapts to the viewer's capabilities.
Web Applications
Web applications allow for greater user interaction than basic websites. Often including a database or other data sources, users can enter infomation, view stored data, etc.
Popular examples of web applications include shopping sites, search engines and social media.
Web Services
Web services are interfaces to infomation used by other software. Web services are what powers your mobile applications' connections to the data behind the popular web applications mentioned above.