WD-40 is a popular household and industrial lubricant and solvent. The name "WD-40" stands for "Water Displacement, 40th formula," indicating that it was the 40th attempt to develop a successful product to displace water and prevent corrosion. It was first developed in 1953 by a company called Rocket Chemical Company, later renamed the WD-40 Company.

WD-40 is known for its versatility and is used for various purposes, including:

1. Lubrication:

WD-40 can be used to lubricate various moving parts such as hinges, locks, and tools to reduce friction and prevent squeaking.

2. Rust Prevention:

It can help protect metal surfaces from rust and corrosion by displacing moisture.

3. Cleaning:

WD-40 is effective at removing dirt, grime, and adhesives from various surfaces. It can be used to clean tools and equipment.

4. Loosening Stuck or Rusty Parts:

It can help loosen stuck or rusted bolts, nuts, and other fasteners, making it easier to remove them.

5. Removing Stickers and Labels:

WD-40 can be used to soften adhesive residue, making it easier to remove stickers and labels from surfaces.

6. Protecting and Restoring Surfaces:

It can be used to restore and protect plastic, vinyl, and rubber surfaces by providing a protective layer.

7. Silencing Squeaky Hinges:

WD-40 is often used to silence squeaky door hinges.

It's important to note that while WD-40 has many uses, it may not be the best choice for every application. For specific tasks, other lubricants or solvents may be more suitable. Always read the product's label and instructions to ensure it is used safely and effectively for the intended purpose.