Explanation:
Electrophiles are electron deficient species and can accept an electron pair from electron rich species. Examples include carbocations and carbonyl compounds. A nucleophile is electron rich species and donates electron pairs to electron deficient species. Examples include carbanions, water , ammonia, cyanide ion etc.
A nucleophile is a reagent comprising an negative charge or lone pair of electrons. As a nucleophile is rich in electron, it looks for electron-deficient locations. Nucleophiles act as Lewis bases, i.e, species which can donate a pair of electrons