Secondary lysosomes are involved in which process?

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Secondary lysosomes form when a lysosome fuses with another vesicle containing material to be degraded. In autophagy, cytoplasmic components or damaged organelles are enclosed in an autophagosome, which then fuses with a lysosome. The resulting autolysosome, or secondary lysosome, contains digestive enzymes that break down the contents, allowing nutrients to be recycled. So, the process most closely associated with secondary lysosomes is autophagy. While lysosomes also digest material from phagocytosis or endocytosis, the fusion with autophagosomes to form a secondary lysosome is a defining feature of autophagy. Exocytosis involves secretion rather than intracellular digestion.