Cell and Molecular Biology is the study of the structure, function, and behavior of cells at a molecular level. It focuses on the interactions between cellular components like DNA, RNA, proteins, and lipids. This field explores processes such as gene expression, cell signaling, and molecular mechanisms that govern cell division, growth, and death. Techniques like PCR, CRISPR, and microscopy are often used to study these biological systems. The knowledge gained has applications in medicine, genetics, biotechnology, and disease research.