In this context, "mouse" is a computer peripheral used to point and click.
AND, OR, and NOT are Boolean expressions that change your search parameters.
If you search "Penciller: Jim Lee" AND "Title: X-Men" it will only return X-Men titles Jim Lee penciled
If you search "Penciller: Jim Lee" OR "Title: X-Men" it will return all comics Jim Lee has Published and all X-Men titles
If you search "Penciller: Jim Lee" NOT "Title: X-Men" it will only return titles Jim Lee penciled other than "X-Men"
