PSRAM, or Pseudo-static RAM, is a type of memory chip that combines the high density of DRAM with the simple interface of SRAM. Unlike traditional SRAM, PSRAM requires periodic refresh cycles like DRAM but manages this internally, making it appear as static RAM to the system. PSRAM is commonly used in embedded systems, mobile devices, and IoT hardware to expand available RAM without the complexity of DRAM controllers. Its external chip design allows for flexible memory expansion in resource-constrained environments, balancing cost, power consumption, and ease of integration.