Ref: https://man7.org/linux/man-pages/man7/glob.7.html

Long ago, in UNIX V6, there was a program /etc/glob that would expand wildcard patterns. Soon afterward this became a shell built-in. These days there is also a library routine glob(3) that will perform this function for a user program.

Here is some basics about Glob:

• ‘*‘ (Asterisks) matches any string, including the empty string.
• ‘?‘ (Question Marks) matches any single character.
• [abc] Character classes (not allowed to be empty), same as Regular Expression
• [a-z] range, same as Regular Expression