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.
Currently 18 GB of RAM is a figure that we can see in very few mobile phones or tablets since it is an excessively high amount for current needs, even for gaming users who want to get the most out of mobile video games since no video game can take advantage of so much memory.
It must be taken into account that a greater amount of RAM memory as well as greater power mean an increase in consumption and therefore less battery hours.