Question Why unity always make animation from sliced sprite?

Hey @adibnafisudin thank you for your question!

Do you mean when dragging in multiple sprites from the Project window into the Scene view? A simple way to tell Unity to not create animation from the dragged sprites/textures is to hold down alt in Win (or opt in Mac) when dragging.

This way, instead of creating an animation clip by default, it creates multiple game objects for the dragged in sprites in the Scene view/Hierarchy panel. So it saves you the trouble of having to do one-by-one.

Slicing sprites from a character sheet is great for animation, flipbook, cut-out, skeletal. Although many users also slice the textures such as environment sheets into multiple sprites or tilesets (into tiles) for other reasons such as world building and use them for Sprite Shapes, Tilemaps or even 9-slice for UI etc. Or sometimes to simply use them as single sprites. So it's useful not just for animation.

Hope this clarifies and happy creating!