why algebra , analysis and topology are considered as very important topics in graduate programmes coursework?

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why algebra , analysis and topology are considered as very important topics in graduate programmes coursework ?

Note : Im still pursuing my master and im going to do phd in future

I see many U.S and other country university this three subject algebra , analysis and topology are always included and make as a compuslory subject in course work

I don't understant why this three topics are make compulsory ?

why not only analysis ? or why not only Algebra ? why not only topology?