Subjectivity in knowledge refers to the notion that knowledge is influenced by individual perspectives and experiences. Epistemology, the study of knowledge, explores this concept through theories that emphasize the role of the mind (idealism), lived experience (phenomenology), and personal experiences (subjectivism). The argument from illusion and the argument from dream challenge the objectivity of knowledge, suggesting that our senses and perceptions are unreliable. Subjectivity in knowledge has implications for its limits and variability, influenced by cognitive science and psychology.