The main idea behind Ravencoin was to make it easier to create and transfer cryptocurrencies that have real uses. Very different assets can fall under this definition, for example, precious metals, antiques, securities, and so on. Those who use the Raven protocol have the ability to independently set rules for their resources and determine its goals, the protocol does not affect the decision. Such assets can be transferred to absolutely any Ravencoin address.
Polygon is a playground for building interconnected blockchain networks. Previously, this project was called the Matic Network (a reflection of this can be seen in the coin's ticker). The direction of its activity is the elimination of those restrictions that exist in the Ethereum network, such as relatively weak bandwidth, an inconvenient interface for users, and transaction delays. Polygon was conceived and created as a platform for launching interoperable blockchains.