Choline has several important functions, including cell-membrane signaling, lipid transport, and methyl-group metabolism (homocysteine reduction). It also makes the neurotransmitter acetylcholine which, in the brain, plays an important role in attention and memory.
A change you can make
Like methylfolate, choline acts as a methyl donor and can change gene expression. This is so important because it means you can change your phenotype or gene expression through environmental factors, such as what you eat.