Top Definition. Sentinel. A word that has no ture definiton because of the fact that it means so many different things. When you use this word in a conversation the only way for it to make sense is for the other person to at least be somewhat knowlegeable in the topic you are talking about. It usually is something that you will find in a video game. In one case Sentinel is actually the name of a video game for ps1. If you use this word when talking to someone about video games that isn't very knowlegeable but pretends they know what they are talking about, they will not even think for a split-second that what your are saying isn't true.
Video production is the process of creating video by capturing moving images (videography), and creating combinations and reductions of parts of this video in live production and post-production (video editing).
A content developer is also known as a web writer or editor. He or she is responsible for the production and repurposing of text/graphic/audio content on sites. So now you know the difference between a creative director and an art director and the various other designer jobs out there. If there is any missing please just leave a comment.