Optical tweezers are scientific tools that use focused laser beams to manipulate small particles, such as biological cells or molecules. By creating a gradient of light intensity, these lasers can trap and move objects without physical contact, allowing researchers to study their properties and behaviors in detail. This technology has applications in various fields, including biophysics, nanotechnology, and cell biology. Optical tweezers enable scientists to perform precise measurements and experiments, such as measuring the forces exerted by molecular motors or observing the interactions between DNA and proteins.