An anion has <em><u>gained electrons</u></em> and therefore has more electrons than protons. It has a negative charge.
An example if this doesn't make too much sense.
Charged Atoms: If electrons are removed from an atom, that atom becomes positively charged because it has more positive charge carriers (protons) than negative charge carriers (electrons)
These types of charged atoms are called positive ions or, cations. DEPENDING ON THE CIRCUMSTANCES, the removed electrons can remain free or they may attach themselves to another atom that can accept extra electrons. If this occurs, a negatively charged ion, or anion, is created.
I hope I made this clear enough for anyone who needed help on this. Hope this helps!!! Have a great day :)))