What is the improvisational technique using short phrases or riffs?

The improvisational technique using short phrases or riffs is often referred to as "motivic development." This approach involves creating and manipulating short melodic or rhythmic ideas to build a larger musical structure. Musicians may repeat, vary, or develop these motifs throughout a performance, allowing for spontaneous creativity while maintaining coherence. This technique is commonly used in genres like jazz, where improvisation plays a central role.