An electrophile is known to be a type of acid that will accept electrons from an atom that is full of electrons. The nucleophile can be an atom, a molecule, or even an ion that comes with a lot of electrons. This is responsible for donating a pair to the electrophile so that a covalent bond will form.
To gain a better understanding between the two, the electrophile accepts the electrons while the nucleophile will donate the needed electrons in order to form the needed bonds. The nucleophile can be positively or neutrally charged while the electrophile is usually negatively or neutrally charged. Their charge alone can give you an idea of what you are dealing with.