What causes an ear infection what are the symptoms and how

An ear infection cab be caused by a bacterium or a virus or a fungus and happens in the outer ear canal or in the middle ear and in rare instances can involve the inner ear too. Know the causes, symptoms and treatment available.
https://www.medanta.org/patient-education-blog/wh
at-causes-an-ear-infection-what-are-the-symptoms-and-how-can
-i-get-treated/