What does (Basic) after a D&D module mean?

[Emerald Viper]

What does (Basic) after a D&D module mean?
What rule set does it work with?
Also is 2st and 2nd edition D&D rule sets the same, I can find 2nd edition core books but not 2st or D&D "Basic"

Example https://www.fantasygrounds.com/store/product.php?id=WOTC2ETSR9261&utm_source=Fantasy+Grounds+Newsletter&utm_campaign=87e32bb67d-Weekly_Newsletter_20180110_COPY_01&utm_medium=email&utm_term=0_0c0bac83de-87e32bb67d-200578669

[damned]

Basic was originally written for one of the B/X, BECMI editions of D&D.

[Emerald Viper]

I know what it was part of physically, but what rule set or edition of D&D is for in FG?

[damned]

It is for 2E

[Emerald Viper]

Thank you