A fly reel is a type of fishing reel specifically designed for fly fishing. It is used to store and manage the fly line, which is a lightweight line that helps cast artificial flies to attract fish. Fly reels come in various sizes and materials, often featuring a drag system to control the tension when a fish pulls on the line. The primary function of a fly reel is to hold the line and provide a smooth retrieval when reeling in a catch. Fly reels are typically paired with a fly rod, and together they allow anglers to present their flies accurately and effectively in the water, enhancing their chances of catching fish like trout or bass.