1. Sales contracts: Sales contracts are used in the sale of goods or services. They specify the terms and conditions of the transaction, including the price, payment terms, delivery terms, warranties, and other important details. Sales contracts protect both the buyer and the seller by ensuring that each party knows what to expect from the transaction.

2. Service contracts: Service contracts are used when one business provides services to another business or individual. They specify the scope of the services, payment terms, duration, and other important details. Service contracts protect both the service provider and the client by ensuring that each party knows what services will be provided and what payment is expected.

3. Employment contracts: Employment contracts are used to establish the terms and conditions of employment between an employer and an employee. They specify the job responsibilities, compensation, benefits, and other important details. Employment contracts protect both the employer and the employee by ensuring that each party knows what to expect from the employment relationship.

4. Non-disclosure agreements (NDAs): NDAs are used to protect a business's confidential information by preventing another party from disclosing it to third parties. They are commonly used in situations where a business is sharing sensitive information with a third party, such as in a partnership or licensing agreement.

5. Partnership agreements: Partnership agreements are used when two or more businesses or individuals team up to work together. They specify the roles and responsibilities of each partner, as well as the profit and loss sharing arrangements. Partnership agreements protect each partner by ensuring that each party knows what to expect from the partnership.

6. Licensing agreements: Licensing agreements are used when a business grants another party the right to use its intellectual property, such as patents, trademarks, or copyrights. They specify the terms and conditions of the license, including the royalty or other compensation that will be paid.

7. Franchise agreements: Franchise agreements are used when a business grants another party the right to operate under its brand and business model. They specify the terms and conditions of the franchise, including the fees and royalties that will be paid, as well as the obligations of both the franchisor and the franchisee.

In summary, commercial contracts are an essential part of doing business, and understanding the different types of contracts and their uses is crucial for any business owner or manager. It's important to ensure that contracts are drafted carefully and reviewed by legal experts to avoid any potential legal disputes.