Chromatography is a technique used to separate mixtures by exploiting differences in how components interact with two phases - a stationary phase and a mobile phase. It was first developed in 1900 by Russian scientist Mikhail Tsvet and involves passing a mixture dissolved in a mobile phase through a column containing a stationary phase. This causes the components to separate as they are transported through the column at different rates. There are several types of chromatography that differ based on the physical state of the mobile and stationary phases, including paper chromatography, thin layer chromatography, gas chromatography, and high performance liquid chromatography.