Blocks have lots of features, such as allowing you to resize blocks while inserting, make modifications in blocks that are transferred to all its references in the drawing, use blocks from other drawings, and so on. But we may not always need these features and for those situations, you can use groups, which in a way work like blocks but with limited functionality:

To understand groups, I will use the preceding drawing. Here, we have a set of cubicles, with the first cubicle containing office accessories such as a table, computer, phone, and so on. We will create our first group using these objects.