Polyunsaturated fats are a type of dietary fat found in various food sources, including fish oil, nuts, seeds, and certain plant-based oils. They are known for having more than one double bond in their chemical structure, which distinguishes them from monounsaturated and saturated fats. The most common types of polyunsaturated fats are omega-3 and omega-6 fatty acids, both of which play crucial roles in bodily functions.