An assembler is a program that takes basic computer instructions and converts them into a pattern of bits that the computer's processor can use to perform its basic operations. Some people call these instructions assembler language and others use the term assembly language.
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Assemblers are actually the main phenomenon of computers which helps us to communicate with the computer well by converting assembly language into the machine language. I wrote paper with essay help that describes this is the main work which are done in computers and are very beneficial for us.