Is comic sans a sans serriff font?

Answer 1

Not really, it's a script font.

Answer 2

Yes, it is a sans serif font (strictly, it is a typeface - a font is single variant of a typeface, such as normal, bold, italic, etc.).

A serif is a small line or stroke added to the end of a primary line or stroke in a letter, numeral, symbol or logogram (characters such as "&" or "@"). Comic Sans doesn't have these (although the upper case "C" and lower case "s" arguably have small ones), and so is sans (from the french word for 'without') serif.