What is Copy-on-write?
'''Copy-on-write (COW)''' is a means of optimisation in [[Computer Science]]. When several callers ask for the same resource, they can all be given a pointer to the same address. Only when they try to change the resource does a local copy need to be made. This happens without the caller noticing. It is done so that all the other callers do not see the change they did not do. {{Tech-stub}} [[Category:Computer science]]