When did .AI format first come into use?

I'm trying to find out when the .AI file format first come into use? Also, what is the difference in size between an Illustrator file saved as a .AI file versus PDF, EPS, and .PNG? Also does saving it as a PNG change the file from a vector image to a bitmap image? If I take an AI file that was saved as a PNG, can I then place it back into AI without losing anything?
I'm a beginner and I'm having trouble getting these answers directly from adobe help.
Thanks

The .ai format has been since Illustrator 88. Back then you did not have .pdf compatibility option, but the format was more like .eps with a preview built in for other apps. Though there are similarities between the current and original, they .ai format has evolved to add features such as transparency since the original version.
The file size depends on the content physical size and compression settings.
The PNG (Portable Network Graphics)is a bitmapped format, so the vector date must get converted to pixels.
Once you convert to .PNG you have lost alot, all font references, bezier shapes. You could print out the both file formats and on a low res printer they may look similar, but the vector graphics print at the maximum resolution of the printer, so you have crisper edges. On a hi resoluiton printer or larger size the 2 formats would look much more different.

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