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Cordapp certificates are used for digitally signing the transactions and messages exchanged between the various parties in a Corda network. These certificates act as a proof of identity for each Corda node or user, ensuring that only authorized participants are allowed to transact on the network. They also enable secure communication channels between the nodes to prevent tampering and ensure data confidentiality.

Interacting with Corda nodes often require the use of certificates to authenticate and authorize access to a particular node or network. For example, to deploy a Cordapp on a Corda node, one needs the appropriate signing certificates to ensure that only authorized parties can deploy and execute transactions within the network. Without these certificates, it would be difficult to establish trust and ensure that participants in the network adhere to the rules and regulations governing Corda networks.