A crossword puzzle's Theme refers to a group of 3 or more common answers in the puzzle that follow the Theme for that day. For example, a Movie Monday puzzle's Theme answers may be about a classic movie or the blockbuster film that came out last week.
 
Our Themes are:
Movie Monday (movies)
TV Tuesday (television)
Wayback Wednesday (pre-1990)
Top 40 Thursday (music)
Sports Fan Friday (sports)
Smartypants Saturday (literature, politics, etc.)
People Sunday (in partnership with People Magazine)