When it comes to RAM, there are several types you can choose from that all have different uses and benefits. The most common types of RAM are SDRAM (Synchronous Dynamic Random Access Memory), DDR (Double Data Rate), DDR2 (Double Data Rate 2), DDR3 (Double Data Rate 3), and DDR4 (Double Data Rate 4). Each type has its own unique features, clock speed, and latency, so it's important to consider which type is best suited for your laptop and its needs. SDRAM is the oldest type of RAM and is the slowest, while DDR4 is the newest type of RAM and is the fastest. DDR3 is the most popular type of RAM and is widely used in laptops today.