Casual dating typically involves spending time together, getting to know each other, and enjoying each other's company without a commitment to a serious relationship, while hooking up usually implies a more physical and casual encounter without the expectation of emotional involvement or long-term commitment. It's important to communicate openly and honestly about boundaries, expectations, and intentions in either scenario to ensure that both parties are on the same page and comfortable with the arrangement. Ultimately, the key difference lies in the level of emotional involvement and commitment between the individuals involved.