Courtship ensures that mating is only between the same species
This maintains gene pool isolation and Pair Bond between Female and Male lead to higher reproductive success
They tend to be repeated / ritualised activities and responses Typically initiated by male
This also typically allowes sexual selection by females = select best male that carry best gene traits giving their offspring higher chance of better traits
Males typically display
Size
Strength
Health
or Beauty
Often have lek system like kakapo where they congregate in one area and perform for females
Typically only few male are chosen where they contribute favourable allele to the gene pool