Being traditionally published means that your manuscript has been accepted by a traditional publishing house and the publisher agrees to produce and distribute your book. Traditional publishing includes a variety of different processes and expectations, including working with an editor, being marketed, and even being offered advances or royalties.
To become traditionally published, an author must find a publisher who will be willing to publish their work, which often requires an agent for huge publishing houses. Agents and publishers will review the submitted manuscripts, and if accepted, the author will work with the publisher to bring their book to life. This offers authors the chance to have their work professionally edited, formatted, and available for purchase universally.
The traditional publishing route can be more involved than self-publishing, as authors will have to put in the effort to find the right publisher or agent, and may have less control over their book’s cover and finished product. However, the tradeoff is that with traditional publishing a book has the potential to reach a much larger audience due to the larger publishing houses' access to resources and long-standing relationships with booksellers.