In Blender, when you render a image or animation, the default render setting is render with grey color background. If you would like to render transparent background in Blender, you can find the option box to check as shown below.
How to Render Transparent Background using Eevee and Cycles Renderer in Blender
Solutions: 1. Go to ” Properties” Panel, 2. Select “Render Properties” Tab, 3. Check the below option box “Transparent”.
Render Transparent Background with Eevee Renderer

Render Transparent Background with Cycles Renderer

Hope this helps! More Free Blender Tutorial here.
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