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    copied!<p>The header files only include the definition of the functions that you would use in a file where the header file is being <em>included</em>.</p> <p>Library files comprise the actual implementation of the functions that you will be using in your program.</p> <p>The header file is included (copy/pasted) during the preprocessing stage and is compiled as part of the program being written during compilation phase. One has to specify the -lpthread in the command line, so that the linker will know which <em>library</em> to look into for functions used in the program.</p> <p>Similar Question/Answer on Stackoverflow explaining it in layman terms:</p> <p><a href="https://stackoverflow.com/questions/924485/whats-the-difference-between-a-header-file-and-a-library">What&#39;s the difference between a header file and a library?</a></p> <p><strong>Part 2</strong>: Why we do not have to <em>always</em> include library files when we have <code>#include</code>?</p> <p>This might be the case when:</p> <blockquote> <p>i. The implementation of the functions is included in the header file. </p> <p>ii. The implementation of the functions is in <code>c</code> files for which you have the source available. </p> <p>iii. The required libraries are <a href="http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html" rel="nofollow noreferrer">included by your compiler by default</a> e.g., standard c libraries.</p> </blockquote> <p><strong>NOTE</strong>: Here is a reference to <a href="http://www.cplusplus.com/reference/" rel="nofollow noreferrer">what is included in the standard C library</a>, which is included by default by many compilers.</p>
 

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