Ionic Compound: A chemical compound made up of ions held together by electrostatic forces termed ionic bonding. Like how Sodium and Chloride stick together to form NaCl.
Ions: An atom or molecule with a net electric charge due to the loss or gain of one or more electrons. Like Sodium (Na+) and Chloride (Cl-) in NaCl.
Electrostatic Forces:Forces between charged particles such as ions; they hold ions together in ionic compounds.