Plasticity refers to the ability of organisms or systems to change and adapt in response to environmental conditions, stimuli, or stressors. In the field of neuroscience, plasticity refers to the brain's ability to reorganize itself by forming new neural connections and pathways, or by strengthening or weakening existing ones. This phenomenon is essential for learning, memory, and recovery from injury. Plasticity can occur at various levels of organization, from individual neurons to entire brain regions, and can be influenced by factors such as age, experience, and genetics. Researchers study plasticity to better understand how the brain adapts and responds to different stimuli, and how it can be manipulated for therapeutic purposes.