NERDTree: what does a starred/bold file indicate?

Question

In NERDTree, what does it mean when a file starred/bold? It seems to happen a lot for me for minified JavaScript files and sometimes for executable shell scripts.

Answer 1

Files with stars are executable files. For example, you can check /usr/bin directory, you are gonna see almost all files in that directory are starred.

For the bold, the current root is bold. E.g., if you select /usr/bin/ then type C, your current root would be /usr/bin, and would be bold right at top of your NERDTree window.

Here I don't see a file name is bold highlighted...