To secure transactions in e-commerce platforms, various technologies such as SSL (Secure Socket Layer), encryption, and tokenization are employed. SSL establishes a secure connection between the user's browser and the server, ensuring that sensitive information like credit card details is transmitted safely. Encryption encodes data to prevent unauthorized access, while tokenization replaces sensitive information with unique identifiers, reducing the risk of data breaches. Together, these technologies enhance the security and trustworthiness of online transactions.