Gmail is a web-based free email service provided by Google. The services allows users to send and receive emails, but also live chat through text, video, and voice with other gmail users. Creating a gmail account also allows access to other services such as Google Maps, Google Drive or Google Photos.
Icloud is a cloud online storage service that can be used on smartphones (iOS, Android) and both Mac and Windows computers. iCloud allows users to transfer their photos, videos, music and other documents to remote servers. The data can be shared and sent to other users of iCloud, automatically backup the data on his multiple Icloud compatible devices.
An Apple account allows you to access most of the Apple services such as iTunes, iCloud, iBooks and synchronise your data between iOS devices and Windows PC. Apple offers a two-step verification with your smartphone to reinforce the security of your account.
The HMRC or “Her Majesty's Revenue and Customs” is a department of the United Kingdom government responsible for collecting several taxes as well as contributions for British social security. It was created on 18 April 2005 during the merger of two organisations, “Her Majesty's Customs and Excise” and “Inland Revenue”.
The Oyster card is an electronic card used for public transportation in London and the Greater London. It’s a payment card for several transportation networks : London Underground, London Buses, London Overground, Tramlink, the Docklands Light Railway, some river boat services and national rail lines.