RAM memory is a type of temporary memory where both the data of the applications that are running and the data of the operating system with which you are working are stored.
It is said that it is a temporary memory since the operating system of the device can erase it depending on the needs it has at all times, in this memory the data and instructions that the system needs to access are stored very quickly unlike the internal memory which is where they are permanently stored (until the system or the user decides to erase).
Therefore, the amount of RAM memory is a method to know how fast and fluid a mobile phone, tablet or smart watch can work, although it is not the only variable since it depends on the rest of the components.
16GB of RAM is a rare feature on smartphones and tablets, but more and more brands and models are adding to this high figure.
16 gigabytes of RAM is still an excessive amount of memory for the normal use of a mobile device, few applications and games can really take advantage of all this capacity, perhaps in the future it will be normal, but currently we can consider it an unnecessary whim just to get fat the characteristics of a device and its price.
Keep in mind that for normal use of a laptop 8 GB is a good figure and with 16 GB it can work very smoothly.