Perception is the process by which individuals organize and interpret their sensory impressions to give meaning to their environment. It involves selecting stimuli, organizing that information, and interpreting it based on existing knowledge. Perception is influenced by factors in the perceiver like attitudes and expectations, factors in the target or situation like size and social context, and cognitive processes like figure-ground perception and perceptual grouping. When perceiving others, shortcuts like stereotyping and halo effects can influence judgments beyond actual behaviors observed.