Blooming is the initial “pre-wetting” of the bed of ground coffee in your brewing device. We want to bloom so co2 can release, and then move out of the way. When co2 escapes, you’re left with the desirable solubles that will bring out the flavors and carmelizations of the beans. The goal of the bloom is to get water working with the ground beans, not working with carbon dioxide.
There’s a science behind how a cup of coffee is made, and it’s called coffee extraction. To put it simply, coffee extraction takes the flavor out of ground beans and fuses it with water. When done well, you get something great. When the extraction doesn’t go well, well… you get a bit of a mess.