When I render my animation I can see each frame being constructed frame by frame and the quality is great, however, when I watch the video that is composed of these frames the video quality is really bad. What should I do?
The most probable cause for this issue is bad video compression. Here are my favorite settings for rendering video.
I would recommend rendering an image sequence instead though, since that offers better formats such as .png
Note: It is nearly impossible to confirm what is wrong without you posting more information.