Photoactivation is a research area that involves using light to trigger specific biological processes or reactions in cells or organisms. This technique is commonly used in the field of optogenetics, where light-sensitive proteins or molecules are genetically introduced into cells or tissues to control cellular activity with high spatial and temporal precision. Photoactivation allows researchers to study and manipulate biological systems with great specificity, enabling a deeper understanding of complex cellular processes and potentially leading to the development of new therapeutic interventions or technologies.