A real estate company is a business that specializes in buying, selling, renting and managing properties. These companies employ real estate agents or brokers who work to connect buyers and sellers, landlords and tenants, and help facilitate transactions. Real estate companies may also provide additional services such as property management, leasing, and appraisal.

There are different types of real estate companies, including:

• Residential real estate companies: These companies specialize in the buying and selling of single-family homes, townhouses, and condos.
• Commercial real estate companies: These companies specialize in the buying and selling of commercial properties such as office buildings, retail spaces, and warehouses.
• Luxury real estate companies: These companies specialize in the buying and selling of high-end properties such as mansions, estates, and vacation homes.
• Property management companies: These companies specialize in managing rental properties on behalf of landlords, including collecting rent, handling maintenance, and finding tenants.
• Development companies: These companies specialize in developing new properties, including building homes, apartment buildings, and commercial properties.

Real estate companies may be independent and locally owned, or part of a larger franchise or national brokerage. They may also be publicly traded or privately held.

It is important to note that in the US, real estate agents and brokerages are required to be licensed by the state in which they operate.

In summary a real estate company is a business that is involved in buying, selling, renting, and managing properties, they employ real estate agents or brokers who work to connect buyers and sellers, landlords and tenants, and help facilitate transactions. They can specialize in different areas such as residential, commercial, luxury, property management or development. And they may be independent or part of a larger franchise or national brokerage.

Here is a list of top real estate companies in the US

• Keller Williams: One of the largest real estate franchises in the world, known for its innovative training and education programs for its agents. Website: https://www.kw.com/
• RE/MAX: A global real estate franchise with over 120,000 agents in more than 110 countries. Website: https://www.remax.com/
• Century 21: A full-service real estate company with more than 9,000 agents in over 78 countries. Website: https://www.century21.com/
• Coldwell Banker: A full-service real estate company with a network of more than 92,000 affiliated sales associates in over 3,200 offices worldwide. Website: https://www.coldwellbanker.com/
• Berkshire Hathaway HomeServices: A real estate brokerage network built for a new era in residential real estate. Website: https://www.berkshirehathawayhs.com/
• Sotheby's International Realty: A luxury real estate brand with more than 22,000 sales associates in over 950 offices worldwide. Website: https://www.sothebysrealty.com/
• Redfin: A technology-powered real estate brokerage that represents people buying and selling homes. Website: https://www.redfin.com/
• Edina Realty: A leading provider of real estate services in the Upper Midwest, with more than 2,000 agents and staff in Minnesota and western Wisconsin. Website: https://www.edinarealty.com/
• Long & Foster: A full-service real estate company with more than 11,000 sales associates and staff in over 200 offices. Website: https://www.longandfoster.com/
• Windermere Real Estate: A leading provider of real estate services in the western United States, with more than 300 offices and more than 9,000 agents. Website: https://www.windermere.com/