painting medias ........

oil is done on surfaces with pigment ground into a medium of oil - especially in early modern Europe, linseed oil. Other oils occasionally used include poppyseed oil, walnut oil, and safflower oil. These oils result in different properties in the oil paint, such as less yellowing or different drying times. It was probably developed for decorative or functional purposes in the High Middle Ages. Surfaces like shields - both those used in tournaments and those hung as decorations - were more durable when painted in oil-based media than when painted in the traditional tempera paints. Many Renaissance sources credit northern European painters of the 15th century with the 'invention' of painting with oil media on wood panel - Jan van Eyck often mentioned as the "inventor".
acrylic is fast-drying paint containing pigment suspended in an acrylic polymer resin. Acrylic paints can be diluted with water, but become water-resistant when dry. Depending on how much the paint is diluted (with water), the finished acrylic painting can resemble a watercolor painting|watercolor or an oil painting. Acrylics are sometimes used in place of watercolors because acrylics dry closer to the desired color (slightly darker, usually) while watercolors dry lighter (and often unpredictably, especially for beginning artists).
water color is a painting technique using paint made of colorants suspended or dissolved in water. Although the grounds used in watercolor painting vary, the most common is paper. Others include papyrus, bark papers, plastics, leather, fabric, wood, and canvas.