Short answers, pulled from the story.
Post-production is the phase where raw footage captured on set is transformed into a coherent narrative after principal photography has concluded. This process often takes longer than the actual shooting of the film itself and can stretch from six months for a small independent film to over a year for a blockbuster laden with visual effects.
Digital non-linear editing systems revolutionized the industry by granting creators the ability to manipulate scenes out of order with unprecedented flexibility. Editors no longer had to physically cut and splice strips of film, which locked them into a linear workflow, and can now jump between any point in the footage to alter the very intention of the movie.
The sound design phase begins with spotting the sound to determine exactly where effects and music will be placed before handing the project over to composers and sound designers. This phase includes recording and re-recording the soundtrack, adding computer-generated imagery to the frame, and culminating in a complex process known as sound re-recording or mixing.
Color grading and correction serve as the final brushstrokes on the canvas by heavily influencing the atmosphere of the movie through the manipulation of light and shadow. Professionals use specialized tools to ensure that every frame conveys the intended mood, and the ability to change the color palette of a scene can completely alter the viewer's perception of time, place, and character.
In music, post-production techniques such as comping, timing correction, and pitch adjustment transform multiple takes into a single, polished composite take through a process known as mixing. Television phases include editing, video editing, color correction, assembly, and the integration of animation and visual effects to prepare content for broadcast.