There are a growing number of phishers out there. They send fake emails that look like they are from companies, and try to get you to give them personal information.
They steal your credit card numbers, SSID, passwords, and bank info.
What To Look For
When you get an email asking for information, look for typos, hover over link to see if they lead somewhere else, and see if they use your name. If you are addressed as "customer" don't trust it.