Google acquired Android in 2005 and in 2007 the Open Handset Alliance was formed between Google and several companies to develop Android. The document then describes Android's architecture which uses the Linux kernel, Dalvik VM, and core libraries. It works by running applications on the Android Runtime through the Application Framework. Currently Android has a large share of the mobile market and smartphone sales. The pros listed include access to device features, equal treatment of apps, lack of boundaries, and ease of use, while the cons note security issues, its open source nature, login problems, and potential incompetence.