T-shirts are a type of casual clothing typically made from cotton or a cotton-blend fabric. They feature a simple design, usually with short sleeves, a round neckline, and no collar. T-shirts come in various colors, patterns, and sizes, making them highly versatile and popular for everyday wear. They can be plain or adorned with graphics, logos, slogans, or artwork, allowing individuals to express personal style, interests, or affiliations. T-shirts are commonly worn by people of all ages and can be dressed up or down depending on the occasion.