Mariamman is a very important goddess in Hinduism, especially in Southern India. Many people worship her because they believe she has the power to protect them from diseases and illnesses.
Imagine if you have a magic protector who can keep you safe from getting sick, that's Mariamman! People build special temples for her where they can go and pray to her for protection.
She is often depicted with three eyes and four arms. Her skin can sometimes look different colors like green or blue. People leave offerings of fruits and flowers at her temple to show their respect and gratitude.
Sometimes Mariamman is also associated with rain and fertility, which means she helps things grow like plants and crops. This is why farmers also pray to her for good harvests.
So, in short, Mariamman is a powerful goddess who people pray to for protection from illnesses and bad luck, and also for help with growing their crops.