Scaffolding is using the process of solving a problem in front of students as a way to teach them the problem. If might remember this from some of your classes growing up. A teacher would explain one or two key concepts and then work through several example problems, solving them in a step-by-step process. The teacher would then ask you and the other students to work on problems by yourselves or in groups.
In an ideal setting, the teacher would be able to roam around the classroom offering help as needed. But given the state of modern class sizes, students would have a better hope of winning the lottery than getting enough attention from the teacher to actually help.