The Sony ALC-SH132 Lens Hood is designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.
Dedicated lens hoods are designed to match the specific focal length of the lens it was designed for.
Reviews Sony ALC-SH132 Lens Hood for Sony FE 28-70mm F/3.5-5.6 OSS Lens (Sony Malaysia)