Nameservers are the servers that answer DNS questions for your domain.
Your registrar keeps a note of which nameservers hold your DNS records. Change the nameservers and you move the whole set of records to a new manager. That is a much bigger move than changing one record.
Owners rarely need to change nameservers. Changing one A record is enough to point a website somewhere new. Moving nameservers by mistake can drop your email records, which is how email breaks during a launch.
ThinkBright does not ask you to move nameservers to go live. We ask for the smallest change that works, and we leave email alone.
DNS is the phone book that turns your domain name into the address of the server that holds your site.
A registrar is the company where you bought and renew your domain name.
An MX record tells the world which server receives email for your domain.
Propagation is the wait while DNS servers around the world pick up a record change.
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