What is PUTTY's paegant.exe in regards to SSH and why is it necessary?

I'm trying to get my Windows Git bash to access a repository on my Linux server and I've come across a couple of tutorials regarding ssh using putty tools.

In them they typically generate a key using puttygen.exe and then use paegant.exe to handle the private key. Is this necessary?

What is the point of paegant.exe for Windows, can I get by without it, and does Linux do something similar?
Who is Participating?
Garry GlendownConsulting and Network/Security SpecialistCommented:
pageant does all he public key authentication for putty ... if you have a remote site that doesn't allow password authentication but requires certificates, you will need to set up pageant ... up-side is - once you configure it, putting your public key part on servers you administer will save you typing your password when logging in, all you need is logging in locally (unlocking the private key), and all remote sites you have the public key part installed you will be logged in with just your username ...
Also, Pageant is supported in other programs as well, e.g. WinSCP ...
EindoofusAuthor Commented:
So does this mean that Windows has no way of authenticating on it's own?
Garry GlendownConsulting and Network/Security SpecialistCommented:
Windows does not do any application-level auth for SSH connections...
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