There are several definitions of the solidarity economy. However, we find this one by RIPESS, the international network for the social and solidarity economy, particularly useful:
"The social and solidarity economy is a movement that aims to change the current social and economic system. Solidarity economic principles serve as the new basis – principles based on solidary exchange that connects individual needs with those of the community."
This might sound quite complicated, but put simply it means to create decent living conditions for everyone around the world. It means that the economy meets the needs of all people instead of just creating more needs – and that national and international policy creates the conditions to enable a supportive framework for this to succeed