SSH is installed but not enabled by default in Raspberry Pi OS. It could easily be enabled using raspi-config utility.
Steps to enable SSH server on Raspberry Pi (Raspberry Pi OS):
Open
Raspberry Pi Software Configuration Tool (
raspi-config) from the terminal.
sudo raspi-config
Select
Interfacing Options from the main interface.

Choose
P2 SSH in the
Interfacing Options menu

Select
Yes to enable
SSH.

SSH server is now enabled.

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