What is the difference between a USB 2.0 and a USB 3.0? Will USB 2.0 ports support USB 3.0 portable drives or pen drives?
In simple layman terms, you can think of it this way that USB 3.0 devices are faster than USB 2.0 devices. In laptops generally they are the "blue" ports or some have a Susper Speed Written on them explicitly
Yes, USB 2.0 ports will support USB 3.0 Pen Drives. Only thing is they will operate at a maximum speed of 480Mbps and not more than that! :)
USB is always backward compatible until now. With Type C, you may have to buy a converter ! :( But that's how it is! which specifies the details.