A device used to separate or allow only specific substances, such as gases, liquids, or light, to pass through while blocking others, often employed in various applications including photography and acoustics.

A piece of equipment that can selectively transmit certain frequencies or wavelengths, commonly utilized in optical experiments or sound recording to enhance clarity by removing unwanted noise.

An instrument designed to capture and remove harmful elements, such as tar and nicotine, from tobacco smoke, contributing to a less harmful smoking experience.

A mechanism that modifies light by allowing only certain colors to pass through, frequently used in photography to alter the aesthetic quality of images.

A small program or function integrated into software applications that extracts or filters specific data according to predefined criteria, often used for organizing or analyzing information.