A coffee filter is a coffee-brewing utensil, usually made of disposable paper that is made of very small particles. This enables it to trap the dirt particles that are big and the small water particles can flow through, thus this gives us pure water.
A metallic mesh filter is appreciated by coffee lovers who want a coffee with more body. The metallic mesh only retains the coffee grounds, and allows coffee oils and soluble solids in coffee to pass through. In contrast, a paper filter will retain most of the oil in coffee. For this reason a paper filter will reduce the amount of cafestol and kahweol, the substances responsible for stimulating cholesterol production in our body.
A stainless steel filter is used to prepare Indian filter coffee, the form of coffee common in India. A golden tone filter is said to improve the taste of coffee, though many coffee lovers admit it might be just a suggestion.