You can froth the milk by heating it up and then shaking it vigorously in a jar. But if you frequently make cappuccinos or lattes at home, I suggest investing in a milk frother. Milk frothers can be manual or electric. My favorite manual milk frother is Bellemain Stainless Steel Hand Pump Milk Frother (14 oz), and if you are looking for an electric frother, go for Milk Boss Handheld Milk Frother. If you have an immersion blender, it also works excellent to froth the milk.