Black-and-white film that you can process at your regular store
Black-and-white chromogenic films like Kodak 400CN (RIP) and Ilford XP2 Super allow you to shoot black-and-white images that can be developed conveniently with C-41 colour processing. That means you can get black-and-white results on colour negative paper from your local pharmacy rather than sending off to a specialist.
There can be a sepia tint from the processing which can be good or bad depending on your preference and what you want to achieve, but the results are not true black-and-white. For ISO 400 the film is renowned for being incredibly sharp with very fine grain, and a convenient and cheap alternative to black-and-white proper.
The film responds in the same way as traditional black-and-white film when using colour filters.