When things effervesce, they fizz and froth like a carbonated drink. Champagne is a well known sweet wine that effervesces.
Anything that bubbles in a foamy, frothy way can be said to effervesce. Soda poured over ice in a glass effervesces, and waves on a beach sometimes effervesce as they break, leaving tiny bubbles on the sand. Things that are bubbly or carbonated are effervescent — and both words come from a Latin root, effervescere, "to boil up or boil over," combining ex, "out," and fervescere, "begin to boil."