It looks like some relative of dragon fly.
To give an idea about its size I picked it by its wings
It had quite a flexible abdomen
I set it free after clicking the pics. I live in central India (If that matters)
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This insect is, indeed, related to dragonflies. This is a damselfly.
Damselflies are Odonata insects from the Suborder Zygoptera. Unlike dragonflies (Suborder Anisoptera), damselflies fold their wings when resting. This is the most noticeable difference between damselflies and dragonflies:
Regarding your specimen, I'd say that it is Caconeura ramburi, the indian blue bambootail. Here is an image for comparison:
The site where I found that image, conveniently called Odonata of India, is a good source of information.