What is Remix's session management?

Remix provides a built-in session API using browser cookies. Create a session storage: const sessionStorage = createCookieSessionStorage({ cookie: { name: "__session", httpOnly: true, maxAge: 3600, path: "/", sameSite: "lax", secrets: [process.env.SESSION_SECRET], secure: process.env.NODE_ENV === "production" } }). In a loader/action: const session = await sessionStorage.getSession(request.headers.get("Cookie")); const user = session.get("user");. Set and commit: session.set("user", userData); return redirect("/dashboard", { headers: { "Set-Cookie": await sessionStorage.commitSession(session) } });. Destroy: sessionStorage.destroySession(session). For server-side sessions (stored in a database): use createSessionStorage with custom createData, readData, updateData, and deleteData methods backed by Redis or a database. Remix's session API works with standard HTTP cookies and is framework-agnostic — the same session can be read by any server.