What type of cipher takes one character and replaces it with one character, working one character at a time

How can i clip a picture to a question on the computer?

How can you know if the person or organization providing the information has the credentials and knowledge to speak on this topic? one clue is the type of web site it is--the domain name ".org" tells you that this site is run by a nonprofit organization.

What allows you to create a wireless connection among your smart devices