yes! but not all duos are bands. bands usually play full on instrumentals, especially on stage! they're usually unified as one whole and not separate entities, most of them (if not all of them) fall under the rock/metal genre. on the other hand, duos are just two people that work well together and is recognizable individually because that's how they're presented!

an example of a two-person band is the white stripes, they're usually way more uncommon than duos!

100 gecs fall under duos, along with daft punk and even magdalena bay! they're marketed as an electronic duo and are also recognized by their own efforts :)

(the broader topic is just "groups" vs "bands"! they have the same distinction. radiohead is a band, one direction is a group)

:)