"Robert Gildea - the Algerian war is ‘an impossible memory’." What is an impossible memory? How do I answer?

5. Robert Gildea has called the Algerian war 'an impossible memory'. What do you understand by this statement and how far would you agree?

I don't know what they mean by an 'impossible memory.'

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…).