Future wireless networks have to deal with a high degree of heterogeneity in terms of device classes, deployment environments, and mobility levels. Coexisting wireless technologies is an encouraging approach to revolutionize future networks. The radio-frequency (RF) based WiFi access points have been already considered to enable indoor traffic off-loading from LTE-cells. In addition to RF, optical wireless technologies such as visible light communications (VLC) open up a new opportunity. VLC is an emerging technology that uses, for example, the existing indoor lighting infrastructure to offer data transmission combined with high-quality illumination. The technology has the potential to add capacity and to be an attractive complementary to off-load data from existing RF networks. In this webinar, we focus on describing the potential of VLC, highlighting different research challenges, and articulating classical as well as machine learning-based approaches to deal with these challenges.