This recent breed of note-taking tools (Obsidian, Notion, logseq, Roam Research) are aimed at enabling a style of personal knowledge base known as networked thinking, which attempts to facilitate the emergent creation of new knowledge by connecting related ideas in your notes.
Of those, Roam and Logseq definitely are, but Obsidian and Notion are much more open-ended in how they can be used, although I think the Obsidian community online does tend to overindex for that kind of usage.