Metastasis is a complex biological process where cancer cells spread from the site of the primary tumor to other parts of the body, forming secondary tumors. This process involves a series of steps, including invasion of surrounding tissues, intravasation into blood or lymph vessels, circulation through the body, extravasation into distant organs, and finally colonization and growth in the new location. Metastasis is a major cause of cancer-related deaths, as it allows cancer cells to establish growth in vital organs and evade current treatments. Understanding the mechanisms underlying metastasis is crucial for developing effective therapies to prevent or treat this deadly aspect of cancer progression.