Expanding my business would be difficult without my network. Maintaining my business relationships is a weekly goal no matter how busy I am. Recently, I realized that my casual friendships are an important component of my overall business network.

I’ve been living and working in Washington, DC for 25 years. I encounter friendly faces almost every day – on the street, at the market, or while riding Metro. Some folks I know by name, while others I just recognize from the neighborhood.

This spring, I needed to diversify my income streams. Two women I know casually stepped in and made introductions. These acts of kindness resulted in new clients. I see these women occasionally, and don’t know them very well. They helped me because I needed support, and expected nothing in return.

A professional network is one of the most valuable tools you can cultivate throughout your career. Connections are intangible, yet developing a network is critical to your trajectory. Your network should contain a variety of individuals from different points in your life. Consider connecting with childhood friends, college buddies, former coworkers, and casual friends who occasionally cross your path. You also need to layer your network with people at all levels. Entry level workers tend to move up the ladder. Administrative assistants know everything. Don’t be influenced by titles.

Most importantly, pay it forward. Help others with no expectations. Make introductions, forward information, host a gathering, and send notes of encouragement.