Answer:
Electrophiles and Nucleophiles are atoms, bonds, or (small or small parts of) compounds that are involved in chemical reactions.
Nucleophiles are "nucleus loving" which means that they want to give up electrons and gain a bond with another atom. These are usually negative or neutral compounds. (-OH base is a good example, the oxygen usually gives electrons)
Electrophiles are the opposite, they are "electron loving" which means that they gain electrons (from the nucleophile to form a new bond). (A carbon-carbon double bond or hydrogen molecule can act as an electrophile for example.)