The <span> tag is used to group inline-elements in a document;

The <span> tag provides no visual change by itself;

The <span> tag provides a way to add a hook to a part of a text, or a part of a document; 

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<!- - or a part of an individual, or a part of a history, or a part of a city, or a part of a territory, or a part of an identity, or a part of a surveillance, or part of senses - ->