Dear student,
The characteristic feature of nerve cell is their way of functioning and their structure -
Structurally, the nerve cell is different from rest of the body cells in having dendrites, a long extension called axon and axon terminal which are in continuous connection with other nerve cells.
Functionally, the nerve cells are electrically active means they get depolarised immediately when they get signals from surrounding; their membrane potential gets reversed while responding to the stimulus.
Regards.