CCNA1-ITNv7 - 2.9.1 Packet Tracer - Basic Switch and End Device Configuration 

line vty is the virtual connection to the management IP of that switch. so in this case there are 5 connections allowed (0-4) and that means 5 separate connections to the management IP. often that will be the IP of SVI for VLAN1

@@arthursalmon3414 where do you get the information that are 5 connections?

some of them are bugs. i acctual just started making my own packet tracers because of the BAD qa Cisco does