Why do I need to add a period after hostname in order to get DNS resolution to work?

C:Usersdavid>nslookup home-pi3
Server:  UnKnown
Address:  192.168.1.1

Name:    home-pi3
Address:  192.168.1.81


C:Usersdavid>ping home-pi3
Ping request could not find host home-pi3. Please check the name and try again.

C:Usersdavid>ping home-pi3.

Pinging home-pi3 [192.168.1.81] with 32 bytes of data:
Reply from 192.168.1.81: bytes=32 time=100ms TTL=64
Reply from 192.168.1.81: bytes=32 time=4ms TTL=64

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