How many tidal patterns exist worldwide?

There are primarily three types of tidal patterns worldwide: diurnal, semidiurnal, and mixed tides. Diurnal tides feature one high tide and one low tide per day, whereas semidiurnal tides have two high tides and two low tides of approximately equal height each day. Mixed tides also have two high and two low tides, but the heights of the tides vary significantly. The specific tidal pattern in a given location is influenced by various factors, including the geography of the coastline and the ocean floor.