A Mask Aligner is a precision tool used in photolithography, a process essential for creating microelectronic devices. It aligns a photomask, which contains the desired pattern, with a substrate coated in photoresist. The alignment ensures that the patterns are accurately transferred onto the substrate during exposure to ultraviolet light. This equipment is crucial in the semiconductor manufacturing industry, where it helps produce integrated circuits and other microstructures. By using a Mask Aligner, manufacturers can achieve high-resolution patterns, enabling the development of smaller and more efficient electronic components, such as those found in smartphones and computers.