Two angles are called complementary angles if the sum of their
degree measurements equals 90 degrees. One of the complementary
angles is said to be the complement of the other.

Two angles are called supplementary angles if the sum of their
degree measurements equals 180 degrees. One of the supplementary
angles is said to be the supplement of the other.

∠ABC
is the supplement of ∠CBD

Have a look at the following video for further explainations of complementry angles and supplementary angles.: