How Does Yeast Provide Flavor?

Question:

I’m wondering how the various yeasts create flavor?

I know yeast gives off co2 and ETOH. If one filters their beer and only those two organic compounds are leftover, how is yeast-flavor created.

Could it be the yeast are genetically engineered to give off other organic compounds that yield flavors?

Answer:

Individual yeast strains produce differing types and amounts of metabolic byproducts, which when taken in combination leave a signature stamp on beer flavor.

Three major groups of metabolic byproducts yeast produce that are responsible for a variety of different flavors in beer are esters, phenols, and diacetyl.

There are many other chemical compounds that fall under these three byproduct groupings.