Traditional wrought iron guild sign of a glazier — in Germany. These signs can be found in many old European towns where guild members marked their places of business. Today they are newly created or even restored, especially in old town areas

A guild is an association of craftspeople or merchants who control the practice of their craft in a town.

Many groups of people started as guilds, including scholars, and religious guilds. Many modern organisations, like universities, started as guilds. However, the basic idea of a guild was to control the training and practice of a trade or business. In Europe, guilds were given authority by the monarch. New young members had to serve as apprentices to a master for a certain length of time (such as seven years). At the end they became full members of the guild, and could set up on their own, and take apprentices of their own. That is the way the European world worked up to and including the first part of the 20th century.