RMB means Right Mouse Button, that is, the right mouse button. If a game or piece of software asks you to press RMB, you just do a right click.

Meaning of RMB key
In French, we simply refer to right click. This is the button located at right on your mouse, the one under your major when you hold it normally. Your index finger, on the other hand, stays on the left button, the LMB (Left Mouse Button).
The main role of the RMB button is to open context menus. Right-clicking with your mouse displays a list of actions tailored to where you click. This menu changes depending on the context: whether you’re clicking on a file, on the Desktop, on a web link, or in a video game, the options available are never the same.
How do you use the right mouse button on your mouse?
On a mouse It's a classic—it's easy to use.
- Put your hand on the mouse, major on the right.
- Press the right button with the middle finger.
- A context menu appears on the screen: the RMB button answered correctly.
When should you use the right mouse button on your computer?
the right click It's used in dozens of situations every day on your computer. Here are the most common ones:
- Right-click on a file : Access to Options Copy, Paste, Rename, Delete, or Properties.
- Right-click on the desktop : access to "Customize," to the Display Settings or to create a new folder.
- Right-click on a link in your web browser: you can open it in a new tab or copy the address. Browsing is much faster if you get into the habit of doing this.
- Right-click on an image or video : Save, copy, or print the file.
- Right-click in a document : The Cut, Copy, and Paste options appear right under your mouse.
In the video games, the RMB button often plays a different role. It is generally used to aim in shooting games, to trigger a secondary action or to cast a spell. It all depends on the game and its key bindings.
LMB and RMB : How to Use Your Mouse Buttons Properly
Your mouse counts several buttons, and each one has a specific role on your computer. It's important to understand the RMB button and the key LMB saves you time, whether you're browsing the web or playing video games.
- LMB (Left Mouse Button) : the left button, used to select or open a file, or to click a link. For more information, see the page on the LMB button.
- RMB (Right Mouse Button) : the right mouse button, which opens the context menus and gives you access to additional actions depending on where you click on your computer.
You can also customize the behavior of the right mouse button. Under Windows, off to the Control Panel, in the "Mouse" section, to swap the buttons or adjust the click speed.






Well explained, it helps a lot of people to understand the meaning of the rmb key.