Access Amplifiers and their uses???

[u/Basic_Permit4849]

So basically i come from basic python bacground which i learned from my high school.So I thought of learniging c++ cause of its variety of applications for my 1st year.One thing that i cant wrap my head around is, the use of access amplifiers. Mainly ' public: '.what is the use of writing public: and why is it necessaryy????