The contents of television programs may be Real, vis a vis documentaries, news, and reality television; or purely fictional as in comedy and drama. It may be current as in the case of news and some made-for-TV movies or historical as in the case of some documentaries or fictional series. It may be primarily instructional as in the case of educational programming, or entertaining as is the case in situation comedy, reality Television, or game shows, or for income in the form of advertisements.

A modern drama program usually features a set of actors in a somewhat familiar setting. The program follows their lives and their adventures. Many shows, especially before the advent of the 1980's, maintained a status quo where the main characters and the premise changed little as the series went on. If some change happened to the characters' lives during the episode, it was usually back to normal by the end. (Because of this, the episodes could usually be watched in any order.) Since the 1980's, there are many series that feature progressive change to the plot, the characters, or both.

Common TV program periods include regular broadcasts (like TV news), TV series (usually seasonal and ongoing with a duration of only a few episodes to many seasons), or TV miniseries which is an extended film, usually with a small pre-determined number of episodes and a set plot and timeline. Miniseries usually range from about 3 to 10 hours in length, though critics often complain when programs hit the short end of that range and are still marketed as "minis." In the UK, the term "miniseries" is only usually used in references to imported programmes, and such short-run series are usually called "serials" there.

Older American television shows began with a title sequence, showed opening credits at the bottom of the screen during the beginning of the show, and included closing credits at the end of the show. However, beginning in the 1990s some shows began with a "cold open," followed by a title sequence and a commercial break. Many serialistic shows begin with a "Previously on..." (such as 24) introduction before the teaser. And, to save time, some shows omit the title sequence altogether, folding the names normally featured there into the opening credits. The title sequence has not been completely eliminated, however, as many major television series still use them in 2007.

While television series appearing on TV networks are usually commissioned by the networks themselves, their producers earn greater revenue when the program is sold into syndication. With the rise of the DVD home video format, box sets containing entire seasons or the complete run of a program have become a significant revenue source as well.