Single-cell research refers to the study of individual cells rather than bulk populations of cells. This approach allows for a more detailed and precise analysis of cellular heterogeneity, gene expression, protein levels, and other biological processes at the single-cell level. Single-cell research can provide insights into cellular behavior, development, disease progression, and response to therapies. This field has seen rapid growth in recent years due to advancements in technology such as single-cell RNA sequencing and imaging techniques.