Questions related to the activities carried after a project, product or application is delivered.
In the ITIL world, maintenance activities are all tasks and practices described as part of Service Operation.
Such activities may have slightly different names depending on the market or company, such like Ops (Operations), maintenance, support, RTB.
RTB (Run the Bank) is more used on the Financial sector, enclosing all support to users and platform maintenance once a new application is live. It appears in contrast to CTB (Change the Bank) which is used for the development stage of the application (i.e. before going live).