Advantage of Colocation

Reliable Connectivity
Redundancy
Green Energy
Fire Protection
Cooling

Cost savings
Redundancy/reduced downtime
Security
Flexibility and scalability
24/7 IT support

If your site needs its own server, you can use the colocation service. The essence of it is that the data center hosts your own servers, they are connected to power and communication channels, but you have to administer it yourself.