This may be a subjective question, but I'm not sure where else to ask, so apologies in advance!
I want to know the name of the software being used to make such purple, pink blocks as shown in the video below
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It is most likely simply a presentation program. The best known is PowerPoint, but you can get one free using Libre Office https://www.libreoffice.org/ or some web-based like google docs.
Libre Office has two programs that can be suitable. Impress and Draw.