What are those folders for on my Samsung phone's internal storage?

If you open the "Internal Storage" with "My files" on your Samsung phone, you see a list folders that comes with the phone and created by different apps.

Here is a brief description of each folders.

• Alarms - Audio files for custom alarm rings you have created.
• Android - Data files created and managed by apps. Don't delete any files from this folder. Some of them are very important to keep apps running normally.
• DCIM - Videos, photos and screenshot you have captured by the phone.
• Downloads - Downloaded files.
• Lazylist - Image files cached by some apps.
• Movies - Movies created and shared by apps.
• Music - Music created and shared by apps.
• Notifications - Audio files for custom notification rings you have created.
• Pictures - Pictures created and shared by apps.
• Playlist - Playlist files used by the music player.
• Podcasts - Podcast files created and shared by apps.
• Ringtones - Audio files for custom call ringtones you have created.
• Samsung - Files created and managed by Samsung apps.
• Videos - Videos created and shared by apps.
• Write on PDF - PDF files created by "Write on PDF" app.
• ... - Other folders are created by various apps.

⇒ Functionalities in "My Files" App

⇐ Keep "My Files" App Updated

⇑ Using Samsung "My Files" App

⇑⇑ Samsung Galaxy Phone - Frequently Asked Questions