Since the late 1990s, market research agencies have been increasingly using web surveys to investigate market, political, or social aspects. In fact, the growing diffusion of the Internet and the availability of fast Internet access have made web surveys an attractive means of collecting survey data, as the web allows simple, fast, and, above all, cheap access to a large group of people. The main types of web surveys are introduced in Section 6.2. Sections 6.3 and 6.4 present the main economic and non-economic benefits of web surveys, while Section 6.5 presents the main drawbacks associated with online research. Section 6.6 discusses the application of web surveys for customer and employee satisfaction research projects and the last section summarises the chapter.