die Abwechslung
variety / change
A change that interrupts routine or monotony and provides variety.
Nach wochenlanger Arbeit brauche ich dringend etwas Abwechslung.
After weeks of work, I urgently need some variety.

variety / change
Loading your saved state.
variety / change
A change that interrupts routine or monotony and provides variety.
Nach wochenlanger Arbeit brauche ich dringend etwas Abwechslung.
After weeks of work, I urgently need some variety.

'Abwechslung' (variety/change) is derived from the separable verb 'abwechseln' (to alternate). It describes the result when things 'wechseln' (change) or follow one another. The ending '-ung' turns the verb into a noun.
Die Jahreszeiten wechseln sich ab und sorgen für Abwechslung in der Natur.
The seasons alternate and provide variety in nature.
When it is about a break from routine, 'Abwechslung' (variety/change) is often used with verbs like 'brauchen' (to need) or 'sorgen für' (to provide). When it describes a sequence, it often appears with 'von ... und ...' (of ... and ...).
Ich brauche mal etwas Abwechslung vom Büroalltag.
I need a bit of variety from everyday office life.
In the meaning of 'Vielfalt' (variety), the word is often used in fixed phrases: 'für Abwechslung sorgen' (to provide variety), 'etwas Abwechslung brauchen' (to need some variety), or to do something 'zur Abwechslung' (for a change).
Lass uns zur Abwechslung mal ins Kino gehen statt fernzusehen.
Let's go to the movies for a change instead of watching TV.
When 'Abwechslung' (alternation) describes a sequence, the structure 'die Abwechslung von [thing 1] und [thing 2]' (the alternation of [thing 1] and [thing 2]) is often used.
Die Abwechslung von Theorie und Praxis macht die Ausbildung interessant.
The alternation of theory and practice makes the training interesting.
change / switch
'der Wechsel' and 'die Abwechslung' both describe that not everything stays the same. 'der Wechsel' usually means that something is replaced by something else, for example a workplace, a provider, or a person. 'die Abwechslung' more often means variety and a break from routine. It often sounds positive because something new makes everyday life more interesting. The words can be confused because both express a change. When something is being replaced, you are more likely to say 'Wechsel'. When something brings more variety, you are more likely to say 'Abwechslung'.

Ein Spaziergang in der Mittagspause bringt mir im Büro etwas Abwechslung.
A walk during my lunch break gives me a bit of variety at the office.
Der Wechsel zu einem neuen Internetanbieter hat viel Zeit gekostet.
Switching to a new internet provider took a lot of time.