What is the difference between sem and information flow?

One is active and the other is passive.

SEM is the consulting behavior that customers actively search for keywords and come to our page.

Information flow is to push corresponding advertisements to customers according to their search history.

Information flow is to get users' attention with good ideas by analyzing and judging users, so that users can pay attention to different advertisements at the target point. Have initiative.

SEM is the eye-catching search ranking, and it is necessary to buy ranking, not creativity. Users actively search, not passively accept.