While headphones with active noise cancelling (ANC) have been around for a long time, technology has progressed a ton in the past few years and has become more and more popular. ANC headphones can help keep you focused in a noisy office or block out engine noise on planes, trains, or buses. Not all ANC performs the same, but since noise cancelling headphones have become so popular, there are now a ton of options in every possible price range, and it can be hard to know which ones are worth it.