A sling is like a special kind of seat or chair that you can use outside in your backyard or on your porch. It's made of fabric that's stretched between two poles or frames, kind of like a hammock, but it's more like a chair because you sit up in it instead of lying down. The fabric is usually made of a strong and durable material like polyester, which means it's able to withstand being outside in rain or sunshine. Some slings are adjustable, which means you can change how high or low you sit in the chair. Sling furniture is great for relaxing outside, reading a book, or just enjoying the fresh air.