An ontology can be defined as a model which represents knowledge as a set of concepts within a domain. An ontology also captures the relationships between these concepts. Ontologies are used to standardize and organize knowledge, making it easier to share and reuse information. Ontology is used to create a formal representation of the entities and their relationships in a knowledge graph, Note that ontology is a general data model, meaning that you don’t have to include information about specific entities in your ontology. Instead, its a reusable framework you could use to describe additional entities in the future. Using ontology as a framework, you can then add in specific real data about your individual entities to create a knowledge graph. Ontologies are similar to knowledge graphs in that they use nodes and edges and are based on the Resource Description Framework (RDF) triples. This similarity can also be seen in their visual representation. Ontology can be used to describe the content of a website or blog by providing a clear and defined structure for the information that is provided. It can be used to help a website rank better in search engine results by providing a clear structure and meaning for the website's content. schema.org is an example of a widely adopted ontology, that is supported by Google Bing Yahoo, Yandex, and a fantastic community that supports semantic representation for the longevity of the internet. Ultimately, this representation of knowledge is supported by technological infrastructure such as databases, APIs, and machine learning algorithms, which exist to help people and services locate, access and process information more efficiently.