SSH is installed but not enabled by default in Raspbian. It could easily be enabled with the following steps;

  1. Open Raspberry Pi Software Configuration Tool (raspi-config) from the terminal.

    sudo raspi-config
  2. Select Interfacing Options from the main interface.
  3. Choose P2 SSH in the Interfacing Options menu
  4. Select Yes to enable SSH.
  5. SSH server is now enabled.