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Softwares is a collection of programs and data that tell a computer how to perform specific tasks. Software often includes associated software documentation. So, This is in contrast to hardware. From which the system is built and which actually performs the work.
At the lowest programming level, executable code consists of machine language instructions supported by an individual processor—typically a central processing unit (CPU) or a graphics processing unit (GPU). Machine language consists of groups of binary values signifying processor instructions that change the state of the computer from its preceding state. For example, an instruction may change the value stored in a particular storage location in the computer—an effect that is not directly observable to the user.
An instruction may also invoke one of many input or output operations, for example, displaying some text on a computer screen. Causing state changes that should be visible to the user. The processor executes the instructions in the order they are provided. As of 2024, most personal computers, smartphone devices. And servers have processors with multiple execution units. Or multiple processors performing computation together. So computing has become a much more concurrent activity than in the past.
They are easier and more efficient for programmers because they are closer to natural languages than machine languages. Or a combination of the two.