What are the differences betwen a lenovo regular laptop and lenovo ideapad?

Ideapads are regular laptops.

What is the difference between Ideapad and Thinkpad?

TP are designed more for business, IPs are more for the home market.

TP is more expensive, but has a more robust construction. IP will have better speakers and glossy screens (considered better in the home market).

TP are pretty much black bricks. IP will come in more colours and are more stylish.

The resons why TP is more expensive is hard to list in a check list. But I believe it is the #1 commercial laptop brand. While some companies buy the most expensive stuff just because they can, most want the best value for money they can get over the long haul. TP systems give them that.

But are boring to look at, the speakers sound tinny and have a higher sticker price.

Ideapad is Lenovo's consumer model laptop. Lenovo also has the thinkpad model which is more known as the business model.
The Ideapad laptops are gonna be much cheaper in price

Their exactly the same but totally different