Lysosomes are small, spherical, sac like structures which contain several digestive enzymes enclosed in a membrane.
They are found in eukaryotic cells mostly in animals.
Lysosomes help in digestion of foreign substances and worn-out cell organelles.
They provide protection against bacteria and virus.
They help to keep the cell clean.
During the disturbance in cellular metabolism, for example when the cell gets damaged, lysosomes may burst and the enzymes digest their own cell. Therefore, lysosomes are also known as suicide bags of a cell