Define onychomycosis.

Onychomycosis refers specifically to a fungal infection of the nails, which can affect the toenails as well as the fingernails. This condition is characterized by changes in the nail's appearance, which may include discoloration, thickening, and possible separation from the nail bed. Fungal infections are caused by various types of fungi, commonly dermatophytes, but can also involve yeasts and non-dermatophyte molds. Recognizing onychomycosis is crucial in nail technology, as it can impact nail health and client options for nail services. Understanding the nature of this infection also highlights the importance of proper hygiene and client education in preventing the spread of nail fungal infections. Other options mentioned do not accurately represent this specific condition, as they pertain to different types of infections or injuries affecting the nails.