title: What's the different between react-router and Next.js
body: <p>i'm currently expolring ReactJS
  i saw <a href="https://nextjs.org/" rel="noreferrer">NextJS</a> and <a href="https://reacttraining.com/react-router/web/guides/quick-start" rel="noreferrer">React Router</a></p>
  
  <p>Can anyone tell me what's the pro cons between the two. I'm not sure if it's right to compare the two, but from what i see, react-router already has SSR feature. So whats the benefit of using NextJS? </p>
  
  <p>Thanks!</p>