Fatal error: Class ‘PDO’ not found

hi, i am new in here and i need some help.
i have been working on an app and having storms of issues, though the most pressing issue i have at hand now is that:
i have just moved my project from xamp to wand and getting this error

Fatal error: Class ‘PDO’ not found, been trying to find my way around it but not yet getting through with it. i will be glad if someone finds this and help me out urgently. thank you.