OTAP stands for Development, Testing, Acceptance, and Production. OTAP is used in ICT and indicates the phases that are undergone in, among other things, software development.
D: A program or component is first developed in the development environment, at the end of each day it is copied into the version control program.
T: This joint version is then automatically converted from program code to a runnable program overnight.
A: If this version is approved, the version can be installed.
P: If the customer accepts it in the acceptance environment, the program is installed in the production environment.
With the OTAP phases, the software is fully tested and approved in an environment like production. The production environment is ultimately protected and continuity is ensured.