An acid-base reaction is called a “neutralization reaction.” It consists of the transfer of a hydroxide ion (H+) from the acid to the base. They are therefore usually “displacement reactions,” but can also be combination reactions. The products are a salt and usually water. Therefore, they are also called “water-forming reactions.” An example is when you take an antacid to neutralize stomach acid from an upset stomach..
Example
NaOH + HCl = NaCl + H2O