The process of keeping important information while removing unnecessary details to simplify a problem is known as.  

Abstraction is the process of simplifying a problem by keeping only the important information and removing unnecessary details. It allows us to focus on the essential aspects of a problem and ignore the irrelevant or complex details. In problem-solving, abstraction helps in breaking down complex problems into manageable parts, making it easier to understand and solve. It is also a key concept in software development, where programmers use abstraction to create models and representations of real-world objects and processes.