Perception is defined as the process by which individuals select, organize, and interpret stimuli into a meaningful and coherent picture of the world. Perception is influenced by both internal and external factors. Internally, an individual's needs, desires, experiences, personality, and learning influence how they perceive and interpret stimuli. Externally, factors like intensity, size, frequency, status, contrast, and repetition of stimuli can impact perception. Individuals do not perceive objective reality but rather interpret what they see based on their unique perspectives and prior experiences.