Tea infuser allows you to easily steep a single cup of tea, or an entire teapot. The infuser allows you to control the infusion time to prevent the over extraction of tannins which result in a bitter cup. Unlike tea strainers, tea infuser(s) usually hold a certain amount of tea leaves, and release flavor from small holes. They are a good option for tea blends and flavored teas that you plan to steep only once and when you are making tea for one person only.
Tea ball, spoon or silicone infusers are usually big enough for one or two teaspoons of tea leaves. They are suitable for larger broken black tea leaves, many green teas, many herbal teas and fruity teas. Use them to steep a single cup of tea.