Downloading Facebook videos without permission from the content creator or violating Facebook's terms of service is against their policy. However, if you have the necessary permissions or are downloading your own content, here's how you can do it:

Method 1: Using a Third-Party Website or App (Not Recommended)

There are various websites and apps that claim to download Facebook videos
. Please note that using these services may violate Facebook's terms of service and may not be legal. Use this method at your own discretion.

Find the Facebook video you want to download.
Copy the video's URL by right-clicking on it and selecting "Copy video URL."
Go to a third-party website or app that offers Facebook video downloading services. Be cautious when selecting a site or app, as some may contain malware or scams.
Paste the video URL into the provided field on the website or app.
Follow the instructions on the website or app to download the video to your device.
Method 2: Using Facebook's Built-In Download Option (for Some Videos)

Facebook allows users to download their own videos or videos from Pages they manage. Here's how to do it:

Find the video on Facebook that you want to download.
Click on the video to open it in full screen.
Below the video, you may see an option that says "Options" or "More." Click on it.
If the video is downloadable, you will see an option that says "Download Video." Click on it, and the video will be downloaded to your device.
Method 3: Using Screen Recording (for Personal Use Only)

You can use screen recording software or apps to record Facebook videos while they're playing on your screen. This method is suitable for personal use only and may not be suitable for sharing or distributing the downloaded content.

Open the video you want to download on Facebook.
Start a screen recording on your device. Most smartphones and computers have built-in screen recording features, or you can use third-party screen recording software.
Play the Facebook video in full screen, and record the entire video as it plays.
After recording, you'll have a video file of the content you wanted to download.
Remember that downloading and sharing copyrighted content without permission can be illegal in some jurisdictions and may also violate Facebook's terms of service. Always respect the rights of content creators and the platform's policies when attempting to download videos.