An assembler is a type of computer program that converts assembly language, a low-level programming language, into machine code, which is a pattern of bits that the computers processor can use to perform its basic operations. Assemblers work by assembling and converting the source code of assembly language into object code or an object file that constitutes a stream of zeros and ones of machine code, which are directly executable by the processor. The output of the assembler program is called the object code or object program relative to the input source program. An assembler primarily serves as the bridge between symbolically coded instructions written in assembly language and the computer processor, memory, and other computational components. Assemblers are classified based on the number of times it takes them to complete their tasks. There are different types of assemblers, including:
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High-level assembler: A program that provides language abstractions more often associated with high-level languages, such as advanced control structures and high-level abstract data types.
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Microassembler: A program that helps prepare a microprogram, called firmware, to control the low-level operation of a computer.
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Inline assembler: Assembler code contained within a high-level language program.
Assemblers are used in situations where very efficient control over processor operations is needed, and they require knowledge of a particular computer's architecture. Assemblers enable software and application developers to access, operate, and manage a computer's hardware architecture and components. Assemblers are also used in manufacturing, where an assembler follows instructions and uses tools to build a wide variety of objects such as engines, control panels, electronic devices, toys, and vehicles.
