what is the difference between node and nodejs version being shown in my terminal ubuntu 17

Question

When I type node -v result: v.10.8.0, npm -v result: v 6.2.0. and finally nodejs -v result: v.6.14.2. I read in other forum saying that node and nodejs are same. If it's true, did I installed two different version of node? Is there really a difference between nodejs and node or both are same.