I don't know what country you are talking about but if it was about Germany then what you just said is a lot of bullshit.
What you can do in Germany is the following: "you're fired, please leave in x weeks" (x depends on the employment contract, usually two weeks). Those two weeks are just a matter of dignity. To give both the business and the employer time to part.
This was an approximation of Norway's rules and was not a load of bullshit. Briefly, firing someone is only allowed if their position is no longer necessary and no alternative position exists, the company needs to reduce its headcount or if the employee has significantly derelicted their duties. There are significant judicial details that usually count in the employee's favor.
Standard terms in employment agreements is three months' notice, although as little as one month may be agreed upon when employment starts. The agreed notice period can only rarely be deviated from without mutual agreement.
What you can do in Germany is the following: "you're fired, please leave in x weeks" (x depends on the employment contract, usually two weeks). Those two weeks are just a matter of dignity. To give both the business and the employer time to part.