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~~What's the meaning of dummy function?~~

What is a dummy variable (in an integral)?

~~While I was learning Gamma and Beta function. I saw that they wrote $x$ is dummy function. What did they mean by dummy? I know that $x$ is changeable.~~
$$\Gamma[n]=\int_0^\infty e^{-x}x^{n-1} \mathrm dx$$

While I was learning about Gamma and Beta functions, I saw that they wrote that $x$ is dummy variable. What did they mean by that? I know that $x$ is changeable.
$$\Gamma[n]=\int_0^\infty e^{-x}x^{n-1} \mathrm dx$$

calculus integration gamma-function beta-function

calculus integration gamma-function beta-function