"An embroidered patch, also known as a cloth badge, is a piece of embroidery which is created by using a fabric backing and thread. The art ...
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of making embroidered patches is an old tradition and was originally done by hand. During the first half of the twentieth century they were commonly embroidered using a shiffli embroidery machine. High-speed, computerized machines have led to mass production.
There are various methods of affixing them to the fabric surface. Embroidered patches can be attached with a pin, sewn on, or affixed with more modern methods such as iron-on, dryer heat-activated adhesive, and Velcro backing." - (en.wikipedia.org 24.02.2021)