Online presence is undoubtedly necessary for every professional.
Listing on local web directories is the simplest way, but may be enough only for some businesses of a purely local nature.
Social media are also offered as a web presence field in a dynamic process, since they offer a direct interaction with a wide audience interested in particular products or services.
In spite of the above tools, a website creation may offer additional features such as online bookings & sales, newsletter campaigns, etc. and of course to fulfill an integrated field of information and major part of a corporate identity.
In any case, the content -of any kind of online presence- should be as comprehensive as possible, perfectly structured, and the individual material being posted - the texts, the photos, the videos or the possible documents - be well-drafted; attractive and enlightening.