Implicit conversion is a process in programming where a compiler or interpreter automatically changes one data type into another without explicit instructions from the programmer. This often occurs when performing operations involving different data types, such as adding an integer to a floating-point number. The system converts the integer to a floating-point number to ensure compatibility and avoid errors. For example, in the programming language JavaScript, if you add a number to a string, the number is implicitly converted to a string, resulting in concatenation rather than arithmetic addition. This automatic conversion helps streamline coding but can sometimes lead to unexpected results if not properly understood.