S-acylation is the process of chemically linking a molecule to another molecule via a thioester bond. Protein S-acylation is a sub-type of S-acylation where the first of those molecules is a protein, and connected to the second through a cysteine amino acid. A prominent type of protein S-acylation is palmitoylation, which promotes lipid membrane association of the protein, for instance to the plasma membrane, Golgi apparatus or inner nuclear membrane.

Reference
Wiki: S-acylation

    In chemistry, acetylation is an organic esterification reaction with acetic acid. It introduces an acetyl group into a chemical compound. Such compounds are termed acetate esters or simply acetates. Deacetylation is the opposite reaction, the removal of an acetyl group from a chemical compound.

Reference
Wiki: Deacetylation

    In chemistry, acetylation is an organic esterification reaction with acetic acid. It introduces an acetyl group into a chemical compound. Such compounds are termed acetate esters or simply acetates. Deacetylation is the opposite reaction, the removal of an acetyl group from a chemical compound.

Reference
Wiki: Acetylation