From traditional guilds to modern digital platforms, communities have always been the bedrock for professional growth and innovation. These networks have evolved from physical marketplaces to today's business communities, but their core purpose remains unchanged: connecting professionals to share knowledge, establish best practices, and accelerate success. In this CSM Corner session, we explore how modern professional communities are transforming from optional networks into essential business accelerators. Our guest speaker, Sue Nabeth Moore, a spearhead for CS communities, shares her top five reasons for joining communities. Valentin Lejot, senior CSM at Planhat, shares lessons from over a decade of active community participation and the tangible benefits he's gained along the way.