Digital filters are tools used in signal processing to modify or enhance signals, such as audio or images. They work by manipulating the data in a digital format, allowing for precise control over how certain frequencies are affected. For example, a digital filter can remove unwanted noise from a recording or sharpen the details in a photograph. There are two main types of digital filters: FIR (Finite Impulse Response) and IIR (Infinite Impulse Response). FIR filters are known for their stability and ease of design, while IIR filters are more efficient but can be more complex. Both types play crucial roles in various applications, from telecommunications to music production.