A liter is a unit of volume. It’s equal to 1,000 milliliters, or about 33.814 ounces.
You’ll see the liter symbolized in many ways: L, l, and even sometimes as 1L (the capital “L”). This is because people often mistake it for an abbreviation of the word “liter.” A liter is another standard unit used to measure volume, meaning “a container with a capacity of one liter.”