Web servers are critical elements of the internet, as every web site needs one in order to function. Essentially, web servers are computers that are responsible for transmitting data from a web site to the site visitor's computer. Without a web server your web site could not exist, because there would not be anywhere to store the data and send it to a visitors computer.
There is a variety of web servers available on the market, with each one designed to accommodate a different range of client needs. If you want your site to perform optimally, then you will need a capable web server. Make sure you become familiar with web servers and their uses before you proceed with your online endeavors.