When I open a directory browsing in vim, I can open a file by moving the cursor to a file name and pressing Enter.
Now, is there any command to go back to the previous directory browsing?
If not, is there a way to open a file without closing the directory browsing mode?
You can go back to the last buffer using :b#.
If you just opened a file, then it will bring you just back to the directory browsing.
Update: Since this answer happened to be accept as the correct answer and is thus on the top, I'd like to summarize a bit the answers, including the one by @romainl that imho is the correct one.
:Rex[plore]: Return to Explorer (by @romainl) vimdoc.sourceforge:Explorer: opens the Explorer, same as :E (if no other command starting with E is defined (see stackoverflow), or as :Ex (see vim.wikia) (by @drug_user841417).:b#: goes back to the "previously edited buffers". See vim.wikia:e# or Ctrl-6 (or Ctrl-^): goes back to the "previously edited file" (by @aman-jain). See vim.wikiaCtrl-O: jump back to the previous (older) location, not necessarily a buffer (by @Peyman). See vim.wikia