Dedicated IPs are unique IP addresses given to you and only you. You don't share it with any other sites on the Internet, as is the case with a Shared IP.
Dedicated IPs will improve your search engine rankings for your website(s) and most hosts don't give them away for free with any plan.
A dedicated IP (Internet Protocol) is a unique Internet address dedicated exclusively to a single hosting account. Normally, several hosting accounts reside on a single server and share that server's IP address. Dedicated IP addresses are usually used for large SSL-encrypted secure websites and particularly large and/or traffic-heavy sites. Most shared hosting users have no particular need for a dedicated IP address.
However a dedicated IP address for your hosting account enables you to view your website via its IP address.
Access your accounts by FTP or the Web when the domain name is otherwise inaccessible, such as during domain name propagation periods.
Ensure faster response during periods of high traffic load.
Set up SSL protection on your website.