This document provides an introduction to hydroponic gardening through a brief history and overview of its past, present, and future applications. It discusses some of the earliest hydroponic systems including the Hanging Gardens of Babylon and Chinampas floating gardens. Today, large scale hydroponic farming is used worldwide and shipping containers are being converted into mobile hydroponic farms. Hydroponics is also being used for food production in space. The future of hydroponic farming includes vertical indoor farms to address population growth and food needs, as well as floating hydroponic farms in the ocean. The document encourages readers to consider starting a hydroponic garden at home.