What is the function of haustorium?

The haustorium is a specialized structure found in certain parasitic plants, such as dodder and broomrape, that enables them to attach to and extract nutrients and water from their host plants. It penetrates the host's tissues, facilitating the transfer of resources necessary for the parasite's growth and survival. Haustoria can also play a role in the exchange of signaling molecules, which may affect both the parasite and host plant's physiology.