What is the function of a narthex in a church?

The function of a narthex in a church is indeed an entrance or vestibule. This architectural feature serves as a transitional space between the exterior of the church and the main body of the worship area. The narthex often provides a place for the congregation to gather before entering the sanctuary and can also have practical functions, such as housing visitors and directing the flow of people. Its presence historically reflects the importance of preparing both physically and spiritually before entering the sacred space of worship.

In contrast, while other areas may serve specific functions, such as the altar area being decorative and sacred or the main area being used for congregational worship, these do not describe the role of the narthex. The area for musical performances would also not apply, as that function typically takes place within the nave or sanctuary rather than in the narthex.