There are many ways to search and browse the NFB online collection.
On the top left of screen, clicking the "film" option allows you to explore by: titles, directors, channels, playlists, and subjects.
Channels offer 19 broad topics in which films are organized. Of note, the accessibility channel contains all the films (from animation to documentary) which have description for the visually impaired.
Playlists include collections developed by NFB experts and media personalities highlighting particular themes. A few theme examples include: "Prime Ministers of Canada," "Learning through Empathy-Secondary and Postsecondary," and "The 1960s: An Explosion of Creativity."
Clicking on the "search" bar allows you to use the Explore option which provides many more options to search and filter. You can explore films by subject, director, or content for teachers. Additionally you can narrow your search by genre, format (such as short-film, feature length, or interview), by language, accessibility, etc.
From any location on the NFB.ca site you can begin a search for a film using the search box in the top left hand corner.