Why people dislike global variables so much while I find them so convenient?

[rempas]

On Tuesday, 25 January 2022 at 10:22:59 UTC, max haughton wrote:
> Passing state down a huge chain is also a code-smell. Writing 
> code that uses a "global" variable is only slightly better than 
> using a global variable.
>
> What is the rough outline of these functions?

What "rough outline" of a function means? Sorry if that sounds 
but I need to learn.