A record
Name to IPv4 address. The record people mean when they say the IP for the site.
An A record maps a DNS name to a 32-bit IPv4 address. Clients still ask for A even on dual-stack networks.
Several A records at one name is round-robin, not a load balancer with health checks. Fast-flux and some CDNs also rotate A answers. Note the TTL and whether the set is stable across lookups.
See also: AAAA record, CNAME, TTL, Fast flux.