Van Gennep is well known for his concept of

The correct answer is Rites of passage. Key Points

• Arnold van Gennep, a French anthropologist and folklorist, is well known for his concept of "rites of passage." He introduced this concept in his seminal work titled "The Rites of Passage" (1909). The concept of rites of passage refers to the rituals and ceremonies that mark and facilitate the transition or change in an individual's or a group's social or cultural status within a society. 
• The concept of rites of passage can be broken down into three distinct phases:
• Separation: This is the initial phase in which an individual or a group is removed from their previous social status or role. It marks the beginning of the transition.
• Transition (or Liminality): The transition phase is a period of ambiguity and transformation. Individuals or groups are neither in their old status nor fully in their new one.
• Incorporation: In the final phase, individuals or groups are formally integrated into their new social status or role. 

Additional Information

• Birth rites, also known as birth rituals or rites of passage into life, are ceremonies or rituals that mark the transition of an individual from the pre-birth stage to being a member of the community or society. These rituals often vary widely between cultures, but common elements include naming ceremonies, blessings, purification rituals, and the presentation of gifts or offerings to the newborn and the parents.
• Death rites, also known as funeral rituals or rites of passage into death, are ceremonies or customs performed after a person has died. They are intended to help the deceased transition to the afterlife and to provide comfort and closure to the living. Death rites can vary significantly across cultures and religions. 
• Marriage rites, also known as wedding rituals or rites of passage into marriage, are ceremonies that mark the union of two individuals in marriage. These rituals vary widely across cultures and religions.

Thus, Van Gennep is well known for his concept of Rites of passage.