Podcasting is basically creating audio files that you upload to platforms whereby others can download them. You can add video and images but, even in just audio format, they can gain a following for you and, when used on a regular basis, will win you over subscribers to your email updates, for example.
People subscribe to your Podcast which should be interesting to those who are in your niche market and your target audience.
Having regular beneficial broadcasts to those that want to hear from you will keep your following loyal. Done-For-You-Internet can host your Podcasts and ensure that they are placed onto the most popular platforms for the biggest exposure.