What is MeToo movement?

MeToo movement was started off in Hollywood when actresses abroad started coming out with the unfortunate incidents that took place with them while they were pursuing their careers. Soon after, women around the world started sharing the incidents that happened with them while using the hashtag MeToo. 
Now, Tanushree Dutta shared how she was molested on sets of Horn Ok Please by Nana Patekar. On the other hand, Kangana Ranaut exposed director Vikas Bahl. Now this hashtag is trending again