Some scammers are posing as online banks to steal money from users. This type of scams which is known as phishing involves stealing the victims' data.
Usually, the scammers proceed in two ways. First, they can send to their target a mail with a specific bank's logo, name and contact details. In this mail, they urge the victim to update their bank details. Often, the source of this message is anonymous and the recipient is asked to reply to this source. In the second case, the mail includes a link that directs the target to the website of his or her bank. However, this website is fake. Here again, the scammers will ask that the user gives their data, usually by filling a form. Once they have obtained the desired information, they can easily access the victims' bank accounts.
Most of the time, texts that appear on the fake bank website are full of spelling mistakes; the address is also not secured (HTTPS). However, if you fear being the target of such maneuvers, you will find online many tips to identify them.