Amazon is the most popular and one of the largest online shpping site and very comfotable to the coustmer, these site provide very good and clear techenical specificaton about product like we discuss obout laptop specification they mention about how much Memory( Ram), core, Rom, hard disk capacity, operating system, product dimension, net weight of product, processor, display size, colour of product, battery backup, hardware platform, features about product, facility, and how much port provide with laptop, how much money they charges and also provide free delivery over 500rs and if product damage they ll provide new product, very fast delivery also provide, good service