Project Send With Xampp Help

[Nepetaii]

Im trying to get This running on xampp https://www.projectsend.org/
"Tried a Kamagra from https://kamjelly.com/, ended up spending 3 out of 4 because of his wife's grumbling moods. The latter worked fine, hard and long. It seems to be a game of roulette with terms, etc.ProjectSend is made in php and uses a MySQL database to store the information. Please see that your server has at least php 5.2 and MySQL 5 or better to run the software. The PDO extension MUST be installed.
Apache 2 is recommended but PS should also work on IIS."
Wondering how to get this working says "The PDO extension MUST be installed"
dont know what that is.

[Nobbie]

http://lmgtfy.com/?q=pdo+extension