Why might someone use a local dialect at home and a standard language in formal situations?

Using a local dialect at home while employing a standard language in formal situations is a common sociolinguistic phenomenon known as diglossia. In these communities, two varieties of the same language are kept functionally separate, with each serving specific social contexts.12

People often adopt this behavior for several reasons:

• Social Context and Prestige: Standard languages are typically associated with education, government, and administration, carrying higher social prestige. Using the standard language in formal settings helps individuals navigate professional or public spheres effectively.32
• Solidarity and Identity: Conversely, the local dialect is often used in informal settings, such as with family and friends. This usage is supported by psychological factors, including a sense of regional solidarity, pride in local traditions, and the relaxed mood associated with informal behavior.32
• Code-switching: The act of alternating between these varieties depending on the situation is called code-switching. This allows speakers to adapt their communication to suit different social or cultural environments, often unconsciously, to better align with the expectations of their audience.45

Essentially, speakers are bidialectal, utilizing their linguistic repertoire to balance the need for formal communication with the desire to maintain personal and cultural connections.35