Suppose $f(x)$ and $g(x)$ are two functions. What is intuition or idea behind the convolution of $f$ and $g$? After taking the convolution we will get a new function. What is the geometric relation between $f$, $g$, and $f*g$ ?
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I suspect this can be answered by a google search or a wikipedia search on the site. Usually people think $f*g$ as an "average" of $f$ with $g$, such that $f*g$ has at least as nice properties as $f$ and $g$. I am sure other people at here can give a much better answer, but hopefully the meaning of it will be clear if you encounter Fourier series or Fourier transform, since that's where they appear most naturally and frequently.