She says, “Let me walk you through this chart.”
To “walk someone through” something means to explain something to someone in detail, giving them all of the information, or to help someone understand something step by step.You're going to take each part and explain it very carefully.
Right now I'm walking you through the vocabulary in an informal business meeting; I'm explaining each word.
A “chart” (chart) is a square or rectangular visual or picture with information that we use for reports and presentations.
We've already talked about pie charts, bar charts, and line graphs; these are all types of charts.So when Hannah says that she's going to walk them through the chart, she means she's going to explain her visual (or picture) in detail so that they can understand it better.
She says she's going to use her laser pointer.A “laser (laser) pointer (pointer)” is a small machine (it looks like a pen) that you hold in your hands, and when you push a button,there's a red light (like a flashlight) that can be used by someone giving a presentation to point at certain objects on the screen.
So Hannah is going to use this laser pointer to point to, or indicate, different parts of the chart to help people know what they're looking at.
She says that the most important features are listed alphabetically under the header.If something is listed “alphabetically” (alphabetically), we mean it is listed (or put) in order from A to Z;it would be from A to Z in descending order, or in the order of the alphabet in the English alphabet: A, B, C, D, E, F, G, and so forth.