Did you just switch to Mac and searching for something similar to PuTTY?
In Mac, there is a similar, built-in application called Terminal.
To start Terminal, go to your Mac’s Applications folder => click on the Utilities folder => then click on Terminal.
How to access a web server using the Terminal?
# ssh email@example.com example: # ssh firstname.lastname@example.org - when prompted for the password, enter your web server password. - to quit the session, type "exit".
Where are the Terminal settings/preferences?
On the top left of your screen, next to the Apple logo, click on Terminal => click on Preferences. From there, you can select various themes and settings.