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.
The definition of realization in finance refers to the act of closing a position to convert unrealized gains or losses into realized gains or losses. While you hold an asset, price fluctuations are just numbers on a screen. When you sell, those figures become real money entering or leaving your account, and from that moment on, they have tax implications.