Tereré (of Guaraní origin[4]) is an infusion of yerba mate (botanical name Ilex paraguariensis) prepared with cold water, a lot of ice and pohã ñana (medicinal herbs),[5] and in a slightly larger vessel.

It is similar to mate —a drink also based on yerba mate—but with the difference that tereré is consumed cold, preferably in the warmer areas of the Southern Cone.

Both refreshing or medicinal herbs are often added, such as pererina, cocú, mint, sarsaparille, horsetail family, burrito, agrial or wax begonia, batatilla, verbena, spikesedges, ajenjo, slender dayflower, escobilla, lemon balm, saffron crocus, ginger, taropé, perdudilla blanca and others.

The area of the Guaraní-Jesuit Missions has a fairly hot climate and this drink is believed to refresh the body and can be a very low-calorie, non-alcoholic beverage.

This practice varies depending on the region, for example, in the Formosa Province (Argentina), as well in the majority of Paraguay, it is normally prepared with medicinal herbs.

New guampas or those not used for some time need to be wet before use, because the lower part is usually capped with a round piece of wood, which expands and prevents leaks after being filled with water.

In Argentina, tereré is usually prepared with citrus juice and its consumption is increasing throughout the country, especially during the summer months, especially among younger millennials.