title: What do .c and .h file extensions mean to C?
body: <p>It's all in the title; super-simple I reckon, but it's so hard to search for syntactical things anywhere.</p>
  
  <p>These are two library files that I'm copying from <a href="https://manual.cs50.net/library/" rel="noreferrer">CS50.net</a>, and I'm wondering why they have two different extensions.</p>