Web hosting is something that every webmaster needs to start his online business or internet business. A web host is an internet service that hosts your website. It makes it viewable through the internet for everyone who has an internet connection.
You could simply host your website on your own computer but for the average user it’s more complicated then simply purchasing web hosting.
A web host company has a big building of computers that are hooked up to the internet 24 hours a day and 7 days a week. These computers contain the files of your website.
When you type a web address in your internet browser adress bar. Once you hit GO or enter. It travels to the appropriate web server and pulls the data or page from that server to display on your internet browser.
Once you sign up for a web hosting company. You will need to change your DNS name servers to your new web hosts name servers. You can do this by logging into your domain registrar.
I highly recommend namecheap.com and 1and1.com for your domain registrations.
Once your nameservers are connected to your new web host. Your domainname.com should point to your new web host with the files that you uploaded to the server.
Hopefully this helps you understand what web hosting is 
