The concept of O2O was put forward by Alex Rampell on 20 10, and its English name is Online to Offline. It also combines offline business opportunities with the Internet, making the Internet the front desk for offline transactions. In this way, offline services can attract customers online, consumers can screen services online, and transactions can be settled online, which will soon reach scale. The most important feature of this model is that the promotion effect can be checked and every transaction can be tracked. Domestic classic network companies: such as: 58 city, handle group purchase, etc. Is the pioneer of model 020. Wedding 020 mode.