Some people call this part of the production process “the magic.” We just call it post.
In digital video, photography or complex media products, post-production refers to the tasks that must be completed after the production period ends. This includes tasks such as the editing of raw footage, color correction, inserting special effects and graphics, working with voice and sound actors. Post-production is the third and final step in digital media production.
Footage preparation and editing
Professional color correction & grading
Voice, music, SFX & mixing