Mega'and(select*from(select Sleep(2))a/**/union/**/select 1)=' Today

: This is used to combine the results of the original query with a new query, often used to extract data like usernames or passwords.

: Log in as an administrator without a password. : This is used to combine the results

: This tells the database to wait for 2 seconds before responding. an attacker could potentially:

If a website allows this input to run, an attacker could potentially: : This is used to combine the results