A room designed and equipped to perform a wide variety of operative procedures. There are a few OTs in a surgical department, depending on hospital size. Each OT is restricted in terms of inflow and outflow of personnel. Note that an OT itself has two distinct areas, sterile and non-sterile. This is not to be confused with the three zones in the surgical department. The definition of the areas can be found in here

A surgical case requires a vast amount of sterile instruments. These are placed on the instrument table prior to the procedure. The scrub nurse constantly draws from this source to supply the surgeon during the operation.

There should also be an uninterrupted power supply. Anti-static flooring should be evident and all electric circuit appropriately grounded.

The figure below shows a typical OT layout prior to procedure. People in green within the sterile area denotes gowned sterile personnel, those in blue in the non-sterile area denote scrubbed personnel.  Move your cursor over the people to identify them.