Catwalk:
1.The ramp at the side of the drilling rig where pipe is laid to be lifted to the derrick floor by the catline or by an air hoist.
2.
Any elevated walkway
3. a long, rectangular platform about 3 ft [0.9 m] high, usually made of steel and located perpendicular to the vee-door at the bottom of the slide.
This platform is used as a staging area for rig and drillstring tools, components that are about to be picked up and run, or components that have been run and are being laid down.
A catwalk is also the functionally similar staging area, especially on offshore drilling rigs, that may not be a separate or raised structure.
