Belief in the enduring presence of ancestors (pitrus) in a subtle ethereal form on a different plane known as pitruloka, or the realm of ancestral spirits, is a commonly held belief among humanity at large, with a particular emphasis in Hindu culture. It is widely held that by performing specific rituals, known as Shraddha, with unwavering faith (Shraddha), these ancestors can bestow upon their descendants both worldly prosperity and even spiritual blessings.
Among the various Shraddhas, the abhyudayika-shraddha is
closely associated with abhyudaya, or the pursuit of worldly well-being. This
particular ritual is performed on auspicious occasions, such as the birth of
children or their weddings. It can even be observed at the inauguration of
charitable endeavors, like dedicating a well, a pond, or a park to the public.
In contrast to other Shraddha s, which are more solemn in nature, the abhyudayika-shraddha is a joyful and celebratory occasion. As such, several modifications have been made to its conduct. For instance, it is conducted in the morning rather than the afternoon. The sacred thread, or yajnopavita, is worn in the customary manner, from left to right. The mantra Svadha,' which is a standard element in other Shraddhas is omitted. Instead of sesame, yava grains (barley) are used as the oblation material.
Abhyudayika Shraddha is also known as equated with Nandishraddha or Vriddhishraddha.