Patch

A patch is a small piece of material used to mend or reinforce a larger fabric or surface. Patches can cover holes or worn areas and may be functional or decorative. They are common in clothing, upholstery, and gear, and can be sewn, glued, or ironed on.

In textiles, patches range from simple fabric scraps to embroidered insignia. Iron-on patches use heat-activated adhesives. Patches also appear as decorative motifs on jeans, jackets, and uniforms, sometimes reflecting rank, affiliation, or achievement.

In computing, a patch is a piece of software released to fix bugs, improve security, or add features. Patches are distributed as files or updates and are applied to existing programs or systems. Patch management involves testing, deploying, and tracking patches to reduce vulnerabilities and downtime.

In medicine, a transdermal patch is an adhesive device that delivers a drug through the skin over a period of time, providing a controlled release. Patches are used for pain management, contraception, nicotine replacement, and other therapies, and require careful handling and disposal.

In other domains, patch can refer to a short network cable (patch cable) used to connect devices, a patch panel for organizing cables, or a patch on a map or landscape indicating a distinct area. The term can also function as a verb meaning to mend or to apply patches.