Shoe
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A shoe is a piece of footwear. Shoes usually come in pairs. A shoe is also an item of clothing. There are many different sizes and colors of shoes, like orange, brown, navy, pink, yellow, scarlet, mauve, black, vermillion, white, beige, cream etc...
Trainers are a type of shoe. They can be used for running in.
Slippers are a kind of indoor shoe. They are often used when it is cold. Shoes keep your feet comfortable people wear them for various reasons like wearing shoes to a party or for hygiene reasons.