Making a completely new plant asexually by a cell or tissue .
Tissue culture also called micropropagation, in which cells or tissue is isolated form the growing tip of the plant called \’ explant \’ . The explant grows into a undifferentiated mass of cells called callus in proper culture medium. Callus is then transferred to a medium containg hormones for growth and differniciation, that develops into plantlet, plantlets are then transplanted into pot or soil to form mature plants.
Tissue culture ??

It is method of raising new plants from small pieces of plant tissue
Growing a new plant by the help of tissue of other plant

The production of new plant from small piece of plant tissue remove from the growing tipbpf a plant in a suitable growth medium called culture medium is known as tissue culture.