13. A system comprising: an entity conflation engine having one or more processors and one or more computer-readable storage media; a data store coupled with the entity conflation engine, wherein the entity conflation engine: receives information about an entity, the information including at least one attribute describing a characteristic of the entity; matches the entity with one or more existing entities in a persistent entity index, wherein the persistent entity index includes entity-attribute pairs associated therewith and the entity-attribute pairs include all received attributes that describe one or more characteristics of an associated entity; aggregates the at least one attribute associated with the entity with the entity-attribute pairs within the persistent entity index; ranks the entity with respect to the one or more matched existing entities using a machine-learning approach; and incrementally updates the persistent entity index to include updated entity-attribute pairs including any subsequently received attributes describing one or more characteristics of the entity at a predetermined time interval.
13. A system comprising: an entity conflation engine having one or more processors and one or more computer-readable storage media; a data store coupled with the entity conflation engine, wherein the entity conflation engine: receives information about an entity, the information including at least one attribute describing a characteristic of the entity; matches the entity with one or more existing entities in a persistent entity index, wherein the persistent entity index includes entity-attribute pairs associated therewith and the entity-attribute pairs include all received attributes that describe one or more characteristics of an associated entity; aggregates the at least one attribute associated with the entity with the entity-attribute pairs within the persistent entity index; ranks the entity with respect to the one or more matched existing entities using a machine-learning approach; and incrementally updates the persistent entity index to include updated entity-attribute pairs including any subsequently received attributes describing one or more characteristics of the entity at a predetermined time interval. 17. The system of claim 13 , wherein the entity conflation engine matches the entity with the one or more existing entities in the persistent entity index using at least one of graph data and web context.