Contiguous simply means touching or sharing a border, according to Merriam-Webster. When it comes to the United States, contiguous refers to all of the states that touch one another, without another country or a body of water coming between them. These are sometimes also referred to as the lower 48 states.
.apk extension stands for android package file. It is a file format used to distribute and install applications.It includes the programm codes ,assets ,resourses ,certificates and manifest file. .Dex extensions stands for Dalvix Executable files.
The kk acronym simply means okay or message acknowledged. It's the same as nodding in person or saying cool, gotcha, etc. It's common to see kk or KK as a text message abbreviation or when you're playing online games. Like other Internet lingo, kk might also be heard said aloud in person, as kay kay. Most of the time, texting abbreviations like this are meant to be lowercase, like lol (laughing out loud) or brb (be right back).