How to go from Charles De Gaulle airport to Paris Downtown?

Charles De Gaulle (CDG) is one of the biggest and most important airports in France. If you need to travel from CDG to Paris downtown, there are mainly three ways to accomplish this task: public bus, metro line, and taxi. Here are all the required details for these three mediums:

•    Metro Line: It is one of the most famous transport systems but runs only on alternate days. You can avail a metro in Paris from CDG airport on Sunday, Monday, and Thursday from 5.30AM to 1.15AM. On Friday and Saturday, these are only available from 5:30AM to 2:15PM. Metro has mainly 16 lines here