Communication is verbal if it includes talking with other people. This can be face-to-face but also over the telephone or via Skype
B2C means Business to Customer. A B2C event is hosted by a company for its customers. It's important for gaining new customers and for satisfieing regular clients.
The title slide is the first slide of a presentation. It usually contains a title and a subtitle.
informal communication can be used when talking to your friends or your family