Putty is a versatile, malleable substance often used in various applications, including construction and arts and crafts. It can be made from different materials, such as clay or silicone, and is known for its ability to fill gaps, seal surfaces, and create smooth finishes. In addition to its practical uses, putty can also refer to a type of software, specifically PuTTY, which is a free SSH and telnet client. This software allows users to securely connect to remote servers and manage them through a command-line interface, making it essential for system administrators and developers.