Co-location (colo)

Co-location (colo) is the model where the customer owns the physical hardware (server, switches, sometimes their own networking) and rents rack space, power, cooling, and bandwidth from the datacenter operator. The DC provides the building and connectivity; the customer provides the hardware and the operating cost (typically billed per U of rack space + per kW of power + per Mbps of committed bandwidth).

Colo makes sense when: (a) the workload requires custom hardware unavailable from any host's catalog (specific GPU models, FPGA boards, custom ASICs), (b) hardware-level security is part of the threat model (the customer wants tamper-evident seals on their own boxes), or (c) the workload is at sufficient scale that owning hardware is cheaper than renting. Most offshore hosts don't offer colo at small scale; SilentHosts focuses on dedicated and below.