Host-Only: the VM will be assigned one IP, but it's only accessible by the box VM is running on. No other computers can access it. IP not received by DHCP . It is static. You will see another interface in host with same IP range as assigned to guest.
NAT: just like your home network with a wireless router, the VM will be assigned in a separate subnet, like 192.168.6.1 is your host computer, and VM is 192.168.6.3, then your VM can access outside network like your host, but no outside access to your VM directly, it's protected. IP not received by DHCP.It is static. You will see another interface in host with same IP range as assigned to guest.
Bridge: you VM will be in the same network as your host, if you host IP is 172.16.120.45 and your VM will be like 172.16.120.50. It can be accessed by all computers in your host network. IP received by DHCP.