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The Graph is a blockchain indexing network. Indexing allows the generation special data structures which make certain data queries much faster. Essentially this allows data to be read off a blockchain easily and quickly. 
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When creating a #dapp, you would usually have to manually set up and manage your own data indexing system. This costs time and money to build and maintain (as well as being hosted in centralised manner). 
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$GRT
The Graph allows a developer to just look for someone managing indexes of their chosen blockchain, and use their system instead. This pretty much sets to the barrier entry on the floor, allowing anyone to develop a #dapp. 
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Indexers change fees for each query made on their index. These prices can be set per indexer, and multiple indexers managing the same blockchain effectively compete for the best prices and most useful/reliable data. 
$GRT
$GRT
