Application Layer in Software.
Classification by operating system : Microsoft, Apple Mac.
Classification by network : Installed vs. Cloud based.
Classification by mobility : Like Android Apps.
This is the top-
OS - Operating system
Its a sub-system of a computing device that is primarily responsible for resource management and security. Its also an interface between users and hardware.
Tip to memorize :- There are several operating systems, some are open-source and others are proprietary.
RAM - Random Access Memory
From the name we can easily interpret that its a kind of memory from which data can be accessed randomly. Response time of RAM is directly related to the speed with which instructions/results can be loaded/executed by mobile OS. In other words, active and most recently used files and programs are stored in this memory.
Tip to memorize :- This memory is a temporary storage and usually gets erased at power down.
Screen resolution in pixels
In simple term’s the cell phone screen can be looked as below
Where intersection of rows and columns are called pixels. Current resolution 15 x 6.
Tip to memorize :- More pixels you have the better resolution you get and better quality of screen response. iphone5 home button issue