Mixed media" is a term used to refer to artworks that utilize multiple mediums or materials. "Oil and acrylic" are terms used to refer to specific types of paint.

Oil paint is a slow-drying paint that is made from pigments suspended in a medium of drying oil, such as linseed or safflower oil. It is known for its smooth, buttery consistency and ability to be blended and layered to create rich, deep colors.

Acrylic paint, on the other hand, is a fast-drying paint made from pigments suspended in a medium of acrylic polymer emulsion. It has a thicker consistency than oil paint and can be thinned with water or mediums to create a variety of effects.

Artists can use both mediums separately or together in one painting, this is called "Oil and acrylic mixed media"