CFDs are complex financial instruments and carry a high level of risk due to leverage. A significant proportion of retail investors incur losses when trading leveraged products such as CFDs. You should carefully consider whether you understand how CFDs work and whether you can afford to take the high risk of losing your capital.
A DDoS attack (Distributed Denial of Service) is an attempt to overload a server or network with massive traffic until it becomes inoperable. Thousands of infected devices (a botnet) send simultaneous requests to the target system. The server cannot handle so many requests at once and stops functioning for legitimate users.