Final answer:
According to Jean Baudrillard, the main source of meaning in the postmodern world is the concept of simulacra and simulation, where the real world is replaced by symbols and signs that are treated as reality.
Step-by-step explanation:
The main source of meaning in the postmodern world, according to Jean Baudrillard, is found in the concept of simulacra and simulation. In his book Simulacra and Simulation (1981), Baudrillard discusses how in a postmodern society, the real world is saturated with and even replaced by simulations, such that these simulacra are treated as reality. Reality and meaning, therefore, become a series of references to other signs, with our experiences and understandings deeply entrenched in systems of symbols and signs that represent, rather than directly reflect, the real world. This idea aligns with the postmodern understanding that reality only exists through our individual interpretations, making meaning a product of our interactions with these simulations rather than an extractable truth from an objective reality.