Dedicated IP For:
1. e-Commece Website(For Using SSL)
2. Installing SSL
3. For Banking sites(user login not secure without SSL)
4. Using SSL on Billing, Money Transfer website
Without SSL your login "details or Data" send insecurely to over network, Your ISP, Hosting Provider can check your Password/data or details.
With SSL: Your Login details send Highly Encrypted, not possible to unencrypt or break