Post-production is part of the process of filmmaking, video production, and photography. Post-production includes all stages of production occurring after shooting or recording individual program segments

Post-production consists of many different processes grouped under one name.
These typically include: Editing the content of the film or television program. Writing, (re)recording, and editing the soundtrack. Adding visual effects – mainly computer-generated imagery (CGI) which is then composited into the frame.
Sound design, sound effects, ADR, foley, and music, culminating in a process known as sound re-recording or mixing with professional audio equipment.
The post-production phase of creating a film usually takes longer than the actual shooting of the film and can take several months to complete because it includes the complete editing, color correction, and the addition of music and sound. The process of editing a movie is also seen as the second directing because through post-production it is possible to change the intention of the movie.
color grading tools and the addition of music and sound, the atmosphere of the movie can be heavily influenced. For instance, a blue-tinted movie is associated with a cold atmosphere and the choice of music and sound increases the effect of the shown scenes to the audience.