High-pass filtering is a technique used in signal processing to allow high-frequency signals to pass through while attenuating (reducing) the strength of low-frequency signals. This is useful in various applications, such as audio processing, where it can help remove unwanted low-frequency noise, like rumble or hum, from recordings. In digital image processing, high-pass filtering enhances the edges and fine details of an image by emphasizing the high-frequency components. This technique is often used in conjunction with low-pass filtering to create effects or improve the clarity of images, making it easier to analyze or enhance visual content.