There are a lot of different reasons why you might want to use your MacBook with the lid closed. You might want to plug into an external display and move your MacBook out of the way to free up space on your desk (although you could always use both screens). Alternatively, you might want to download a software update or play music from your Mac and have found that as soon as you close the lid the download or music will stop.
If you want to stop your Mac from sleeping when you close the lid then you’ll find out how to do that below including the MacBook closed lid settings you need.
Read more at Macworld.com