warranty / guarantee
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warranty
The legal obligation of a seller to be responsible for a certain period of time for ensuring that a sold item is free of defects.
Auf Elektrogeräte hat man in der EU eine zweijährige Gewährleistung.
In the EU, electrical appliances come with a two-year warranty.
'Gewährleistung' (warranty/guarantee) comes from the verb 'gewährleisten' (to guarantee/to ensure). It therefore describes the act or result of ensuring something.
Der Staat muss die Meinungsfreiheit gewährleisten.
The state must guarantee freedom of expression.
In everyday life, you will most often encounter 'Gewährleistung' (warranty) when buying products. Here it refers to the seller's legal obligation to be responsible for defects in the goods.
Mein neuer Laptop war kaputt, aber zum Glück habe ich noch Gewährleistung.
My new laptop was broken, but luckily I still have warranty coverage.
In the legal sense, you have an 'Anspruch auf Gewährleistung' (claim/right to warranty) or can 'die Gewährleistung in Anspruch nehmen' (make use of the warranty). The duration is also often mentioned, e.g. 'zwei Jahre Gewährleistung' (two years of warranty).
Wenn das Gerät nicht funktioniert, sollten Sie Ihre Gewährleistung in Anspruch nehmen.
If the device does not work, you should make use of your warranty.
In the general meaning, 'Gewährleistung' (ensuring/guarantee) is often used with the genitive or the preposition 'von' (of) to say what is being ensured. The structure is often 'die Gewährleistung der/des [noun]' (the ensuring of [noun]).
Zur Gewährleistung der Datensicherheit werden alle Verbindungen verschlüsselt.
To ensure data security, all connections are encrypted.
fuse / backup / safety
'die Sicherung' and 'die Gewährleistung' can both express that something is meant to be protected or guaranteed. 'Sicherung' is broader and often means a concrete measure: you protect something, fasten it, or bring it to safety. 'Gewährleistung' more often means that someone is responsible for something or guarantees something. In the context of buying things, 'Gewährleistung' is also a legal term for the seller's obligation in the case of defects. There is a risk of confusion because both can provide security. For a protective measure, 'Sicherung' fits; for a guarantee or legal responsibility, 'Gewährleistung' is more appropriate.
Beim Kauf der Waschmaschine fragte Lisa nach der Gewährleistung.
When buying the washing machine, Lisa asked about the warranty.
Wegen des starken Winds kümmert sich der Hausmeister um die Sicherung der Baustelle.
Because of the strong wind, the caretaker is taking care of securing the construction site.