Why are positively charged ions electrophiles ? Watch
So why would they accept electron pairs, making them electrophiles? Surely this would be pointless, as the electrophile having accepted the electron pair would be back to square one ?
Electrophiles are pretty much just more reactive forms of the atoms and they are generally needed in order to cause a chemical reaction that is due to high electron density of a molecule.
We only really see them in electrophilic addition -- the electrophiles accept an electron pair from the alkene's pi bond (double bond) to become covalently bonded to the molecule and form a saturated compound and in electrophilic substitution where the electrophile accepts a pair of electrons from the benzene ring's delocalised pi ring system to form a covalent bond to the benzene ring.