if you have a minute or two, look at what Wikipedia is saying about PR: https://en.wikipedia.org/wiki/Public_relations
Public relations (PR) is the practice of managing the spread of information between an individual or an organization (such as a business, government agency, or a nonprofit organization) and the public. Public relations may include an organization or individual gaining exposure to their audiences using topics of public interest and news items that do not require direct payment. This differentiates it from advertising as a form of marketing communications. Public relations is the idea of creating coverage for clients for free, rather than marketing or advertising. An example of good public relations would be generating an article featuring a client, rather than paying for the client to be advertised next to the article. The aim of public relations is to inform the public, prospective customers, investors, partners, employees, and other stakeholders and ultimately persuade them to maintain a certain view about the organization, its leadership, products, or political decisions. Public relations professionals typically work for PR and marketing firms, businesses and companies, government, government agencies and public officials as PIOs and nongovernmental organizations, and nonprofit organizations. Jobs central to public relations include account coordinator, account executive, account supervisor, and media relations manager.
Public relations specialists establish and maintain relationships with an organization's target audience, the media, and other opinion leaders. Common responsibilities include designing communications campaigns, writing news releases and other content for news, working with the press, arranging interviews for company spokespeople, writing speeches for company leaders, acting as an organization's spokesperson, preparing clients for press conferences, media interviews and speeches, writing website and social media content, managing company reputation (crisis management), managing internal communications, and marketing activities like brand awareness and event management  Success in the field of public relations requires a deep understanding of the interests and concerns of each of the client's many publics. The public relations professional must know how to effectively address those concerns using the most powerful tool of the public relations trade, which is publicity.
In a Nutshell: If you have something of relevance for the public, your customers, your market, your peers, your community, then just find the right multipliers, partners, media, social media channels, and make them convinced that your message is also for them a great message to spread and you are there.
If you have no idea or just some idea about how this could work for you, do not hesitate to ask us. We are happy to explain the procedures and the requirements for successful communication to you. And also help you to get the ball rolling. Oh, and we do not necessarily make a difference between PR and Marketing. Because the best Marketing is a true story shared with the world. The tubes, channels, vehicles to transport this story have to be discussed. What this all costs? Depends, but it's reasonable and appropriate, we guarantee!
And about that 4D Communications stuff? What's this about? We prefer to explain this to you in person :-)