die Mum
mum
A colloquial term borrowed from English for one's own mother.
Meine Mum hat mir zum Geburtstag einen Kuchen gebacken.
My mum baked me a cake for my birthday.

mum
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mum
A colloquial term borrowed from English for one's own mother.
Meine Mum hat mir zum Geburtstag einen Kuchen gebacken.
My mum baked me a cake for my birthday.

'Mum' is a word from English and is used in German only colloquially. It is an informal and modern way to talk about one's own mother.
Ich gehe am Wochenende mit meiner Mum einkaufen.
I'm going shopping with my mum at the weekend.
The word 'Mum' is almost always used together with a possessive pronoun such as 'meine' (my), 'deine' (your), or 'seine' (his).
Hast du deine Mum schon angerufen?
Have you called your mum yet?
The use of 'Mum' can often be heard among younger speakers. It can sound modern, but it is not used equally by everyone or in all regions of Germany.
Meine Mum ist die Beste, sie hilft mir immer.
My mum is the best; she always helps me.
mother / nut
'Mutter' and 'Mum' can both refer to one’s own mother. 'Mutter' is neutral and understood everywhere. 'Mum' is a casual form borrowed from English and sounds more personal or modern. 'Mum' is used more in private conversations, especially when talking about your own mother. The words can be confused because they refer to the same person. The difference is mainly in tone: 'Mutter' is safe and neutral, while 'Mum' is colloquial.

Ich habe meine Mum gestern nach der Arbeit angerufen.
I called my mum yesterday after work.
Im Krankenhaus wartet die Mutter neben dem Bett ihres Kindes.
At the hospital, the mother waits beside her child’s bed.