B+ tree stands for a balanced tree. It is a data structure used to store or retrieve data quickly. It's like a family tree, where each 'node' holds a certain amount of information and each 'branch' is connected. The B+ tree allows you to store a lot more information than a regular tree, meaning it is better for larger data sets. To store or retrieve data from a B+ tree, you start at the root node and then move down the tree, making comparisons between the data points stored in each node. You eventually reach a point where you know the data you want is either in the node you're in, or in one of the other nodes connected to it. This makes searching for data much quicker than searching a regular tree.