where people adopt certain behaviors, styles, or attitudes simply because others are doing so.
More specifically, it is a cognitive bias by which public opinion or behaviours can alter due to particular actions and beliefs rallying amongst the public.[2] It is a psychological phenomenon whereby the rate of uptake of beliefs, ideas, fads and trends increases with respect to the proportion of others who have already done so.[3] As more people come to believe in something, others also "hop on