Dual Data Rate Synchronous Dynamic Random-access Memory (DDR SDRAM) or simply DRAM has emerged as the de facto memory technology for the main memory due to its many advantages: high density with simplistic architecture using a capacitor as a storage element, low latency and high performance, almost infinite access endurance, and low power. Selecting the right memory solution is often the most critical decision for obtaining the optimal system performance. This white paper provides an overview of the JEDEC memory standards to help SoC designers select the right memory solution, including IP, that best fits their application requirements.