does MacBook Pro need a DAC?


Not an engineer with a basic question. Just got a new MacBook Pro. It has AudioMIDI setup with format up to 96k hz.
I am using it by plugging in a cable into a headphone jack with the other end going into the receiver. A friend suggested I get a DAC. but I don't see what purpose would an additional DAC serve. Isn't my MacBook Pro already converting digital to analog signal? and is it doing it efficiently? enough for high quality reproduction? thanks in advance to all who respond
petar3
Take a look at a Schiit Modi 3,  excellent performance and inexpensive.  You will hear a difference immediately. 

petar3

And other Mac book(Pro)  experts- I am interested in an older model that has the Super Drive (CD/DVD playback). And suggestions?

Happy Listening!
Any outboard DAC will likely be better than the internal one.  I’ve found that a good DAC is key to having the music converted properly. Even with cheap speakers you’ll likely hear a quite noticeable improvement.  When I moved to an outboard DAC on my Mac Mini, a Meridian Director,  I was amazed at the improvement. So much that after a couple weeks I upgraded to the Schiit GUNGNIR Multibit. It was crazy how much better the music was.  Two hours into the GUNGNIR and I knew I couldn’t live with it. I had to have the Yggdrasil. All three upgrades within a six week period.  The DAC is extremely important. It’s where the music starts. 
If money is an issue, you can get Audirvana for $79.00  It is a vast improvement on the built in DAC.  

I have an external DAC in my main system and use a Innuos Roon core, but when I travel I can even hear a huge difference using my MacBook Pro and a bluetooth speaker