SSL Certificate:
It is a small data file which when installed creates an encrypted link between the web browser and the server to ensure secure transfer of information in encrypted form so as to protect it from being modified or misused by any third party. There is CAs (Certification Authorities) from where you can buy the desired SSL certificates. CA is an entity that is responsible for issuing SSL certificate and for verification and authentication of applicants. But it is advisable to request SSL certificate from a trusted CA. Comodo is one of the leading and trusted SSL certificate issuing entity.
How SSL Certificate securing your website:
When Comodo issues SSL Certificate, it verifies the information provided by applicant and makes sure that all the information (such as company name, address, physical existence etc) provided is correct and also checks the legality of it. As security is main concern, it follows various verification steps, which might take time, thus making the process of issuing SSL certificate time consuming. It takes a day or two to get a SSL Certificate, but it also depends upon the type of SSL certificate you opted for.
There are few Comodo SSL certificates that can be installed within minutes such as Free Comodo SSL. Before issuing the SSL certificate, Comodo makes sure that applicant is genuine and the data provided is correct, if it is not the case, then SSL certificate will not be issued and the request will be rejected. Once the SSL Certificate is issued, the link between the browser and the server will be in encrypted form or secured, and the data shared is also encrypted so that it is in non-readable form and cannot be modified or misused.
Various Comodo SSL certificates: There are various SSL Certificates that Comodo supports. These are categorized in three groups:
Single domain
Multiple domain
Wildcard
You can choose from these categories as to which SSL certificate would be more useful in your case as well as would be more cost effective.