Can you clarify what athlete's foot really is?

Fungal infection. Athlete's foot is a fungal infection of the skin. Usually using an topical antifungal consistently will resolve the problem. This will commonly reappear. Dr l.
Fungus Infection. It is another name for tinea pedis. Itchy lesions in the plantar area of your foot, rx is antifungal cream.
A fungal skin... ...Infection. Athletes (and not only them) have sweaty feet, and fungi thrive in moisture.
Foot fungus. Athlete's foot is a fungal infection of the skin of the foot. The different fungi that can cause this can also cause 'jock itch' and ringworm. It needs to be treated with antifungal cream or ointment; there are many effective over-the-counter choices.