How are benign neoplasms different from malignant neoplasms?

A neoplasm is an abnormal mass of tissue that results when cells divide more than they should or do not die when they should.

A malignant neoplasm is cancerous, and may spread to other parts of the body. A benign neoplasm is not cancerous. It may cause problems locally, but does not spread.
Benign means it is not long-lasting. If you are talking about neoplasms or cancers, Benign means the tumor cannot undergo metastasis, whereas a Malignant tumor can and develop into advanced stages of Cancer.