Theology is the study of religious belief from a religious perspective, with a focus on the nature of divinity and the history behind religion. It is taught as an academic discipline, typically in universities and seminaries. It occupies itself with the unique content of analyzing the supernatural, but also deals with religious epistemology, asks and seeks to answer the question of revelation. Revelation pertains to the acceptance of God, gods, or deities, as not only transcendent or above the natural world, but also willing and able to interact with the natural world and to reveal themselves to humankind.

Theologians use various forms of analysis and argument (experiential, philosophical, ethnographic, historical, and others) to help understand, explain, test, critique, defend or promote any myriad of religious topics. As in philosophy of ethics and case law, arguments often assume the existence of previously resolved questions, and develop by making analogies from them to draw new inferences in new situations.

The study of theology may help a theologian more deeply understand their own religious tradition, another religious tradition, or it may enable them to explore the nature of divinity without reference to any specific tradition. Theology may be used to propagate, reform, or justify a religious tradition; or it may be used to compare, challenge (e.g. biblical criticism), or oppose (e.g. irreligion) a religious tradition or worldview. Theology might also help a theologian address some present situation or need through a religious tradition, or to explore possible ways of interpreting the world.

Theology is often considered one of the oldest academic disciplines, rooted in early human attempts to understand the divine, moral order, and existence. In the Western tradition, theology held a central place in medieval intellectual life.^{[citation needed]} Many of the first European universities, such as the University of Paris (established c. 1150), the University of Oxford (c. 1096), and the University of Bologna (1088), were founded primarily to educate clergy and focused initially on theological studies, with faculties in philosophy, law, and medicine developing later. Theology was traditionally regarded as the "queen of the sciences", with philosophy often described as its "handmaiden", due to its guiding role in the search for ultimate truth.

The term "theology" derives from the Greek theologia (θεολογία), a combination of theos (Θεός, 'god') and logia (λογία, 'utterances, sayings, oracles')—the latter word relating to Greek logos (λόγος, 'word, discourse, account, reasoning'). The term would pass on to Latin as theologia, then French as théologie, eventually becoming the English theology.

Through several variants (e.g., theologie, teologye), the English theology had evolved into its current form by 1362. The sense that the word has in English depends in large part on the sense that the Latin and Greek equivalents had acquired in patristic and medieval Christian usage although the English term has now spread beyond Christian contexts.

Greek theologia (θεολογία) was used with the meaning 'discourse on God' around 380 BC by Plato in The Republic.

… ὀρθῶς, ἔφη· ἀλλʼ αὐτὸ δὴ τοῦτο, οἱ τύποι περὶ θεολογίας τίνες ἂν εἶεν;
τοιοίδε πού τινες, ἦν δʼ ἐγώ· οἷος τυγχάνει ὁ θεὸς ὤν, ἀεὶ δήπου ἀποδοτέον, ἐάντέ τις αὐτὸν ἐν ἔπεσιν ποιῇ ἐάντε ἐν μέλεσιν ἐάντε ἐν τραγῳδίᾳ.