Here's a breakdown:

* Acid: A substance that donates a proton (H+)

* Base: A substance that accepts a proton (H+)

When an acid and base react, the hydrogen ion (H+) from the acid combines with the hydroxide ion (OH-) from the base to form water (H2O). The remaining ions from the acid and base combine to form a salt.

Example:

Hydrochloric acid (HCl) + Sodium hydroxide (NaOH) → Sodium chloride (NaCl) + Water (H2O)

In this reaction:

* HCl (acid) donates H+

* NaOH (base) donates OH-

* NaCl (salt) is formed from the remaining ions Na+ and Cl-

* H2O (water) is formed from H+ and OH-