What fungal infection is commonly known as ringworm and is highly contagious?

The fungal infection commonly known as ringworm is identified as tinea corporis. This condition is characterized by circular, red, itchy patches with a clear center that resemble a ring. The term "ringworm" derives from the appearance of the infection rather than any involvement of worms. Tinea corporis is caused by dermatophytes, a type of fungus that thrives in warm, moist environments and can easily spread from person to person or through contaminated surfaces, making it highly contagious.

Tinea pedis, often referred to as athlete's foot, affects the feet and does not present the ringlike appearance associated with tinea corporis. Scabies is caused by a mite infestation, leading to intense itching and rash but is not a fungal infection. Impetigo is a bacterial skin infection and also does not resemble the fungal nature of ringworm. Thus, the answer correctly identifies tinea corporis as the specific fungal infection that is commonly known as ringworm.