There are several reasons for sending or receiving cryptography. Sometimes the sender and recipient are the same individuals. Perhaps a trader like to:

Transfer cryptocurrency between wallets for exchange
Send cryptocurrency between a trader's smartphone, laptop, or hardware wallet.
Send cryptocurrency from a trader's mobile wallet to a trader's exchange wallet, or vice versa.

Sending or receiving cryptography serves several crucial purposes in modern digital communication and transactions. Firstly, cryptography ensures confidentiality by encrypting sensitive information, such as personal data, financial details, or proprietary business information, making it unreadable to unauthorized parties. Secondly, it provides authentication, verifying the identity of parties involved in a transaction or communication, thus preventing impersonation or fraud. Additionally, cryptography ensures integrity by detecting any unauthorized alterations or tampering of data during transmission, maintaining its accuracy and reliability. Finally, cryptography enables secure communication over insecure channels, such as the internet, by safeguarding data from interception or eavesdropping. Overall, the use of cryptography is essential for protecting privacy, securing transactions, and maintaining trust in digital interactions.