How important was Nelson Mandela compared to F.W De Klerk in the achievement of Civil Rights in south africa?

Essay needs to be 2000 words, got some information but need a little bit more background information and If Nelson Mandela was Very Important, why was he very important compared to F.W De Klerk? Thanks :]

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).