Cleanliness is very important in Islam. Muslims are not to pray in a dirty area and the bottoms of shoes are considered unclean. When entering the house of your host, or even your own home, be gentle in your manner of entering and leaving. Lower your eyes and your voice. You should take off your shoes at an appropriate spot and set them in an orderly fashion. Do not forget the etiquette of wearing and removing shoes. Put on the right shoes first and remove the left one first.

Islamic Etiquette
Etiquette in Islam

Traditionally, shoes are not worn in households in nations such as India, Indonesia, Japan, Korea, Philippines, Thailand, Malaysia, and Vietnam, nor in certain holy places elsewhere, such as mosque and many Buddhist or Hindu temples. The typical expectation is that shoes will be removed in the foyer and left neatly with toes pointing outside. Socks or stockings should be very clean and in good condition. In regions where shoes are not worn in houses, these rules also apply to restaurants, except those with Western-style tables and chairs