The outer ear, the visible flap of skin protruding from the head, is called the pinna, or auricle.
Whilst some animals have an ability to direct their pinna, the range of movement control by humans is very small, or absent for most folk.
The pinna shape may help some animals in concentrating sound, but this is not significant in humans.
the ear drum
Your hand effectively acts as a larger sound collector (a "bigger ear") to collect more sound waves and focus them into your ear.
As part of the external ear, the auricle or pinna acts like a horn to capture sound waves. They are then diverted or collected into the auditory canal. At the end of the canal is the tympanic membrane (eardrum) which changes the sound into vibrations to be transmitted further into the ear.
The auricle or pinna of the outer ear acts like a horn to capture the sound waves which are then tunneled into the auditory canal and strike the tympanic membrane (eardrum).
Your ear!
The ear does not produce (make) sound.
The Pinna which is the external ear
ear drum
The shape acts like a parabolic antenna, focusing sound into the ear from a larger surface area. Simples.
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.