A flag patch is a little piece of cloth that has the picture of a flag on it. You can put it on your clothes or bag to show that you love and support your country. In some countries, it's even a rule for soldiers to wear flag patches on their uniform so that people can recognize them easily. A flag patch can be a symbol of pride and love for your country, and a way to show others that you are part of a group or team that supports your country.