A web developer is a programmer who makes websites, and apps for the World Wide Web. A web developer builds an internet site from rock bottom up, developing everything from layout to functions and features on the page.
TL;DR: a web developer makes what you’re looking at right now.
A good web developer can make almost anything happen on an internet site and may build custom code to accommodate the requirements of their client. Web developers have an intricate understanding of various programming languages and how they’re used.
A web developer might work at one organization as a permanent full-time employee, or work as an independent consultant.
A web developer’s salary depends on what kind of work you’re involved in, your location, experience, and level of seniority.