A playlist on YouTube is the best way to create a custom list that contains your favorite videos. You can group videos by channel or interest, and also share your playlist for use or editing by others.

The majority of content on YouTube can be added to a playlist, but there are some exceptions. If you want to add videos “specifically for children” to a YouTube playlist, you are out of luck, as these videos are restricted due to the US COPPA regulations, which are designed to protect children and cannot be added.
Creating a new YouTube playlist
If you want to create a new YouTube playlist, you'll need to find a video you want to add first, then use that video to create your playlist. The steps to do this are slightly different for web and mobile users.
On YouTube Web
To create a new YouTube playlist on the YouTube website, find and open the first video you want to add.
Below the video there are various options for providing comments with “like” and “dislike” annotations, as well as for sharing or saving the video. Click the “Save” button to continue.
In the “Save to” box, you can either save the video to the “Watch later” playlist, to another playlist, or to a new playlist.
Click “Create new playlist” to start creating a new playlist.
Add a name for your playlist in the “Name” field. You can use up to 150 characters for this.
You must also set the privacy level for your new playlist. You can set it to public (allowing anyone to search for it and view it), unlisted (makes it public but hides it from search) or private (only you can see or find it).
When you are satisfied with your choices, click “Create” to add your playlist.
The video you saved will be added immediately to the playlist as its first video, which you can then find in your YouTube library by clicking “Library” from the left menu.
You will also find the playlist referred to by name a few steps below, under the “Watch later” playlist in the left menu. Clicking this link will take you directly to the playlist.

On Android, iPhone and iPad
Creating a playlist is a similar process on the YouTube apps for Android, iPhone , and iPad.
You must first open a suitable video and then press the “Save” button below it.
By default, YouTube will add it to the most recently created playlist or to the “Watch later” playlist if you have no other playlists available.
A notification will appear at the bottom of your screen. Press the “Change” button to edit the storage location if you want to add it to a new playlist.
In the “Save video to” options menu, press the “New playlist” button at the top right.
Enter a name for your playlist and, then, set the privacy level to public, unlisted, or private.
Click “Create” to save your selection.
Once saved, the video will be added to your new playlist.
You can also do this for multiple videos by selecting the “Library” tab in the lower menu. From there, click the “New playlist” button.
A list of the videos you have watched recently will appear here. Check the box next to the video (or videos) you want to add and, then, select the “Next” button.
You'll be presented with options for naming your new playlist. Give it a name and set the appropriate privacy (public, unlisted, or private), then tap "Create" to save the playlist.

Whether you decide to create a playlist while playing a video or from your library on YouTube, your playlist will be visible in the library.
