The Cochlea, but techinically it's the inner ear.
The hairs in the cochlea are responsible for producing the nerve impulses that travel to the brain's temporal lobes to be interpreted as sound.
The ear does not produce (make) sound.
The Pinna which is the external ear
That would be the brain. The ear itself is only designed to transfer the wave frequency through the hair cells in the cocchlea to the auditory nerve. The auditory nerve sends the signal to the brain where it is interpreted.
ear drum
Sound travels through the air - causing the ear-drum to vibrate. This sends impulses to teh brain which is interpreted as sound.
By multiple vibrations in the air aka sound waves. An object which creates kinetic energy produces air pressure variations which are interpreted as sound by the brain via the ear drum and the nerves in the inner ear.
The sound waves come through the auditory canal and hit the eardrum (or tympanic membrane). The eardrum is connected to the 3 ossicles of the middle ear: the hammer, anvil and stirrup (or malleus, incus and stapes). The eardrum vibrates the hammer, the hammer vibrates the anvil, the anvil vibrates the stirrup and the stirrup vibrates the cochlea in the inner ear which has hair-like nerve endings called cilia that move when the cochlea vibrates. The auditory nerve sends the vibrations to the brain to be interpreted. That's how we hear! :)
Ear canal
External (outer) ear.
The pinna of the ear collects sound waves. This is the part you see on the side of the head.
That part is called as ear lobe or the pinna of the ear.