Regular filters are tools used in various applications to separate or modify data based on specific criteria. They can be found in software programs, such as spreadsheets and databases, where they help users sort and display information more effectively. By applying a regular filter, users can focus on particular subsets of data, making it easier to analyze and interpret. In the context of digital media, regular filters can also refer to image processing techniques that enhance or alter visual content. These filters adjust aspects like brightness, contrast, and color balance, allowing users to improve the quality of images or create specific artistic effects. Regular filters are widely used in applications like Adobe Photoshop and Instagram.