Web hosting is the business practice of providing space and bandwidth on a high-powered computer server that is connected to the Internet at very high speeds. Hosting companies maintain large networks of high-powered web server computers in a physical location known as a data center. These computer servers are connected to a very fast, and generally redundant, Internet connection. The data centers have primary and backup power, a fast connection to the Internet, and a security monitoring staff.
The web hosting companies provide a share of disk space and available bandwidth to a customer for a monthly fee. Squarespace Plugins
Once the customer is signed up, they can upload files to their personal space on the web server and the information is then viewable to anyone interested on the Internet. The monthly fee the web hosting company charges is much less than what it would cost to run a server out of your own home or data center. This is the reason these companies exist. They take care of all the hardware, software, and other technical needs for you.