A giggle is a high-pitched, bubbly way of laughing

Laughter

Laughing is a reaction to certain stimuli, fundamentally stress, which serves as an emotional balancing mechanism. Traditionally, it is considered a visual expression of happiness, or an inward feeling of joy. It may ensue from hearing a joke, being tickled, or other stimuli...

. It is usually suppressed, resulting in short bursts of laughter. A giggle is often considered a very feminine laugh. Giggling is sometimes affiliated with laughing gas a dentist would administer. Giggling is also sometimes done nervously. Giggling is often associated with small children.