Sure..
When the main fermentation is over the yeast has basically run out of sugars to eat up. The yeast that is in suspension is still hungy for food (sugar) so when you transfer to a bottle and give it some more food and cap it / seal it it has a feast, a by-product of that feast is the production of c02 which as it cant escape is absorbed by the beer and gives it life (condition / bubbles) hence the reason to use more sugar for fizzy lager than you do an ale which just needs some life but not bubbles.
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