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Why You Should Avoid Using #include <bits/stdc++.h> While Writing Code? The aim of including header files while writing code is to allow access to predefined or user-defined functionality which will aid in building programs. The #include keyword instructs your C++ compiler to process (literally insert, and read at that point in code) the contents of the specified header file during compilation. Several competitive programmers make use of it due to the convenience of reducing time spent writing programs.