Cell proliferation assays are techniques used to measure total cell count, proliferation rate, or metabolic activity. Common methods include cell counting, cell proliferation labeling, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazole) analysis, etc. These technologies are used to study cell growth, drug screening, toxicity assessment, and malignant transformation of tumor cells. By quantifying cell proliferation, scientists can assess biological processes, disease development, and drug effects, providing important data for biomedical research.