Lysosomes are found in all eukaryotic cells, which are cells that have a nucleus and other membrane-bound organelles. This includes cells from animals, plants, fungi, and protists.

While they are present in all eukaryotic cells, they are particularly abundant in cells that are involved in breaking down materials, such as:

* White blood cells: Lysosomes help break down bacteria and other pathogens.

* Cells in the liver and kidneys: Lysosomes help detoxify the body and break down waste products.

* Macrophages: These cells engulf and break down cellular debris and pathogens.

It's important to note that lysosomes are not found in prokaryotic cells, which lack a nucleus and other membrane-bound organelles.