As I know, they help programmers to discover errors in programs, and I believe that developers work with something like that. I think it can actually affect the final result, that's why it's important to work with developers who are aware of it. In general, it's hard to find reliable ones, but I'm glad that in magento ecommerce, there are still decent specialists.
In computer science the term "interpreter" is sometimes used instead of the term emulator. There are software interpreters and hardware interpreters. We will denote interpreter as a software interpreter. It can also refer to a program that performs compilation as well as emulation. Most interpreters available today generally compile source code when the code is first encountered during program execution, rather than in a separate phase prior to execution.
An interpreter has a number of advantages over a compiler, including:
Because it can be tailored to a specific programming language making it simpler to implement and more compact (BASIC was supported on many early home computers for this reason).
it allows program implementation to be independent of the characteristics of the host cpu (the Java interpreter is a good example of this).
The main disadvantage of interpreters is that when a program is interpreted, it runs slower than if it had been compiled. The difference in speeds could be tiny or great; often an order of magnitude and sometimes more.
When a computer program is designed in some computer language like Java, C or C++ then computer needs to understand the instructions which are given in that language. So these instructions are translated by a program into a machine language that is also called the interpreter.
So there are basically 2 types of interpreter which I've mentioned. One is the real human beings who translate the language of the words in the other desired languages while on the other side the interpreter of computer works to convert some computer language in machine language. I hope this answer is sufficient for you to understand.
An interpreter is programme that translates a high-level programming language into machine language during the actual step-by-step execution of a programme. Translation and execution alternate for each statement encountered in the high-level language programme. In other words, an interpreter translate one instruction, and the control unit execute the resulting, machine language, the next instruction is translated, and the control unit execute the machine language instruction, and so on. If the programme is sun seven times a day, the programming language is reinterpreted seven times.
In case of a compiler, the whole source program is translated into an equivalent machine language programme. The object programme, thus obtained is permanently saved for future used and is used every time the programme is to be executed. So repeated compilation is not necessary for repeated execution of a programme. However, in case of an interpreter, no object programme is saved for future use because the translation and the execution processes alternate. The next time an instruction is used, it must once again be interpreted and translated into machine language. For example, during the repetitive processing of the instruction with in a loop, each instruction in a loop will have to be reinterpreted every time the loop is executed.