Question

define endocytosis.​

Answer 1

Endocytosis is a type of active transport that moves particles, such as large molecules, parts of cells, and even whole cells, into a cell.

Answer 2

Endocytosis is the ingestion of material by the cells through the plasma membrane.

It is a collective term that describes three similar processes : phagocytosis, potocytosis & receptor mediated endocytosis.

These processes are pathways to specifically internalize solid particles, small molecules and iron, and macro molecules, respectively.

All of them require energy, so they may be regarded as different forms of active transport.