Companies have different web development departments

 Companies have different web development departments that design and develop their websites. The dept. generally is consist of a team graphics designers, web developer, content writers, web testers and employees related to their marketing department to guide the designers.

to develop a trending and approaching a website that can beat others and create a buzz in the market. On the other hand, some companies just hire some Web Developing agencies, the agencies that only work on web development platform.