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Showing content from https://docs.unity3d.com/Manual/DrawCallBatching.html below:

Manual: Introduction to batching draw calls

Enable draw call batching

Introduction to batching draw calls

Draw call batching is a draw call optimization method that combines meshes so that Unity can render them in fewer draw calls. Unity provides two built-in draw call batching methods:

Static batching: For static GameObjectsThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObjectâs functionality is defined by the Components attached to it. More info See in Glossary, Unity combines them and renders them together.
Dynamic batching: For small enough meshes, this transforms their vertices on the CPU, groups similar vertices together, and renders them in one draw call.

Unityâs built-in draw call batching has several advantages over manually merging meshes; most notably, Unity can still cull meshes individually. However, it also has some downsides; static batching incurs memory and storage overhead, and dynamic batching incurs some CPU overhead.

Render pipeline compatibility Feature Universal Render PipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info See in Glossary (URP) High Definition Render Pipeline (HDRP) Custom Scriptable Render Pipeline (SRP) Built-in Render Pipeline Static Batching Yes Yes Yes Yes Dynamic Batching Yes No Yes Yes Limitations

Transparent shadersA program that runs on the GPU. More info See in Glossary often require Unity to render meshes in back-to-front order. To batch transparent meshes, Unity first orders them from back to front and then tries to batch them. Since Unity must render the meshes back-to-front, it often canât batch as many transparent meshes as opaque meshes.

Unity canât apply dynamic batching to GameObjects that contain mirroring in their Transform componentA Transform component determines the Position, Rotation, and Scale of each object in the scene. Every GameObject has a Transform. More info See in Glossary. For example, if one GameObject has a scale of 1 and another GameObject has a scale of â1, Unity canât batch them together.

If you are not able to use draw call batching, manually combining meshes that are close to each other can be a good alternative. For more information on combining meshes, see Combining meshes.

Warning: When you access shared material properties from a C# script, make sure to use Renderer.sharedMaterial and not Renderer.material. Renderer.material creates a copy of the material and assigns the copy back to the Renderer. This stops Unity from batching the draw calls for that Renderer.

Enable draw call batching

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