Colocation data center is when a data center company rents out the entire facility to another company. A colocation rack, on the other hand, is when they rent out rack space within a data center to multiple companies.
The distinction is sometimes referred to as ‘wholesale colocation’ for the renting of an entire data center, and ‘retail colocation’ for just renting out a set amount of rack space within a data center. Most companies will be looking for colocation server racks, so they can have access to the amount of space they need, at a fair price.
Many retail colocation data centers will allow you to rent out entire racks (which can then be locked in many cases, for additional security) or even just individual spaces within a rack. Whatever the data center needs your company has, colocation data center solutions are likely the ideal option.