To make your website available to the internet community, the website files need to be hosted on a web server. A web server is a powerful computer, which can accommodate thousands of requests for your website pages. A web server has to be connected to the internet all day and night so that users can access it anytime. A web hosting provider is a company that sells space on these web servers to website owners like you. They provide a full-time, high-bandwidth connection to the internet, so that visitors can access your site easily.
Reasons for not hosting a website on your home computer: Server and server software (web server, mail server, firewall, virus protection etc.) can be expensive. The server needs a 24/7 high speed connection to the internet, which is relatively costly. Setting up all the configurations including mail server, FTP server and DNS server can be complicated. Server maintenance requires 24 hour support, special skills and knowledge.
Now-a-days web hosting is very cheap (usually starting from under $5/month) due to intense competition in the web hosting industry. There are free web hosting companies also, however, they are not recommended for professional or company websites. The free web hosts will recover their costs by showing ads on your website, and provides less flexibility in terms of having your own domain names and email addresses.
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