Perception is the process of receiving and interpreting sensory information. It involves selecting stimuli, organizing that information, and attributing meaning based on existing knowledge and biases. Perception is influenced by factors within the perceiver like attitudes, motives, and expectations, factors within the target like novelty and size, and situational factors like time and social context. People use perceptual shortcuts like selective perception, halo effects, stereotyping, and projection to make judgments about others.