Coffee brewing can be divided into two basic categories: infusion and percolation. Infusion involves pouring hot water onto coffee grounds, leaving them to brew, then separating the grounds from the brewed coffee. In contrast, percolation involves passing hot water through the coffee grounds.
Infusion is the original way of making coffee, this was how coffee was made for centuries until various technological innovations were made in the 19th century.
Brewing coffee is relatively simply. You just need a way to grind the beans, then add water, which dissolves various chemical compounds in the coffee beans, including caffeine and there you have it: coffee - 6 hours ago