Import Library but Download first?

[OscarBoots]

Hi,

Please help a newbie to understand how to access libraries.

I've practised with some code & used the import 'xxxxx'.

I'm curious to know whether I should have downloaded this library to my PC before I want to run 'import'?

Sorry if that's a dumb question but I got the impression that when you downloaded Python, it would import automatically any library you needed?

I've been getting some errors like "Cannot find 'xxxx' ..."

Can anyone clarify if I should download any Libraries onto my pc I want to use before I include them in the code.

Thanks