1. Disinfection of Water: Chlorine is a powerful disinfectant used to kill bacteria and viruses in drinking water, swimming pools, and wastewater treatment. It's the most widely used method for ensuring safe drinking water worldwide.

2. Production of Chemicals: Chlorine is a key ingredient in the production of numerous important chemicals, including:

* Polyvinyl chloride (PVC): A versatile plastic used in construction, pipes, and various consumer products.

* Solvents: Used in various industrial processes, including cleaning and manufacturing.

* Bleaches and Disinfectants: Common household products for cleaning and sanitizing.

3. Bleaching: Chlorine is used in the production of bleach for whitening textiles, paper, and other materials. It's also used to remove color from pulp and paper during processing.