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In 2000, Fred Shapiro, a librarian at the Yale Law School, published a letter revealing that John Wilder Tukey's 1958 paper 'The Teaching of Concrete Mathematics' contained the earliest known usage of the term 'software' found in a search of JSTOR's electronic archives, predating the OED's citation by two years.

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Prior to 1946, software was not yet the programs stored in the memory of stored-program digital computers, as we now understand it the first electronic computing devices were instead rewired in order to 'reprogram' them. Computer science is the theoretical study of computer and software (Turing's essay is an example of computer science), whereas software engineering is the application of engineering principles to development of software. This eventually led to the creation of the academic fields of computer science and software engineering both fields study software and its creation. The first theory about software, prior to the creation of computers as we know them today, was proposed by Alan Turing in his 1935 essay, On Computable Numbers, with an Application to the Entscheidungsproblem (decision problem). Because of the proofs and the algorithm, she is considered the first computer programmer. She created proofs to show how the engine would calculate Bernoulli numbers. Software may also be written in a low-level assembly language, which has a strong correspondence to the computer's machine language instructions and is translated into machine language using an assembler.ДЄn algorithm for what would have been the first piece of software was written by Ada Lovelace in the 19th century, for the planned Analytical Engine. High-level languages are translated into machine language using a compiler or an interpreter or a combination of the two. They are easier and more efficient for programmers because they are closer to natural languages than machine languages. The majority of software is written in high-level programming languages. As of 2015, most personal computers, smartphone devices and servers have processors with multiple execution units or multiple processors performing computation together, and computing has become a much more concurrent activity than in the past. The processor executes the instructions in the order they are provided, unless it is instructed to 'jump' to a different instruction, or is interrupted by the operating system. An instruction may also invoke one of many input or output operations, for example displaying some text on a computer screen causing state changes which should be visible to the user. 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. Machine language consists of groups of binary values signifying processor instructions that change the state of the computer from its preceding state.

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This is in contrast to hardware, from which the system is built and actually performs the work.ДЄt 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).

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Software is a collection of instructions that tell a computer how to work.

The application software layer interfaces with the operating system, which in turn communicates with the hardware. A diagram showing how the user interacts with application software on a typical desktop computer.

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