India China Informal Summit started in 2018 at Wuhan and 2nd summit was organised at Mammallapuram, near Chennai.
Background
Informal Summit is the diplomacy at the highest level, that is, between the heads of the states. It includes candid exchange of views and direct talks. It is not planned rather it takes place when the need is felt.
It is unlike the formal summits which is agenda driven which includes targets and outcomes. Thus it is a forum where countries could explore the areas of convergence and cooperation which is not influenced by any outside world.
Wuhan summit decreased the tensions generated by the Doklam crisis which led to the understanding that informal friendly impromptu platform is a necessity for international diplomacy and sound bilateral diplomacy.
Realizing that both countries are economic giants and 21st century belongs to Asia, India and China have acknowledged that India and China are not enemies but are economic powerhouses with converging interests.
Outcomes of Indo-China Informal Summit
Thus both sides while acknowledging the sensitivities of each other, are using the informal summits to a fruitful result.