What for 2 times ports are assigned?

Question

elasticsearch

In the elastic dock, there is such a command

docker run -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:7.5.1

Why 2 times?-p 9200:9200 -p 9300:9300

Answer 1

the container port is mapped to the port of the host system.