The Opera browser is used for general Internet use such as viewing websites, receiving and sending emails, managing connections, IRC online chatting, BitTorrent uploading, and reading web feeds. Opera is available for free on computers, mobile phones, and tablets. Opera started as a research project at Telenor, Norway's largest telecom company. Opera's main components include browsing, tabbed essentials, thumbnail and zoom features, a variety of mouse cursor skins, and an integrated download management section. In terms of security, Opera has built-in protection against phishing attacks and software known as malware (malware), and it also has the ability to maintain security while browsing websites and delete personal information such as cookies.