Hanuman, the monkey God is considered Chiranjeevi (will live eternally). He is stong, full of valour, with various skills and powers. At the same time , he is wise, a great gnani, a yogi, a brahmachari. He had the one thought only - that of serving his Lord Rama with utmost humility and devotion. He is known as Siriya Thiruvadi. He is considered to be an amsam of Lord Siva.

He is worshipped in the temples as Bhaktha Hanuman & Veera Hanuman. He is seen seated humbly in front of Rama vigrahmas in the Rama sannadhis. There are also separate temples for Hanuman. As Bhaktha Hanuman he is seen holding both hands together in prayer. He is seen as Veera Hanuman, holding the mace in one hand & the sanjeevi Parvatham in the other. Devotees are blessed with courage, valour, wisdom, gnanam. He is very happy when he hears the Rama namam. Hence repeating the Raama namam is the best way to get his blessings.

About Lord Hanuman:
Hanuman or Anjaneya is the son of Anjana Devi. She was once a celestial maiden & was born as a monkey-woman as a result of a curse. She was living happily with her husband Kesari. When king Dasaratha performed a yagna praying for off-springs, he was yielded a pot of payasam(pudding) from the yaga fire. His wives shared the prasada & thus Rama, Lakshmana, Bharatha & Shatrugana were born. A portion of this payasam was carried by the Lord of winds - Vayu Deva & fell in the hands of Anjana Devi and she gave birth to a lovely & strong son. Since Vayu Deva was responsible for the payasam reaching Anjana, he is also considered the father of Hanuman. (Vayu Puthran Hanuman).

He grew up as a strong & mischievous young lad. He could travel as fast as the wind. He mistook the glowing sun to be a fruit & flew upto the sky & reached for the sun. Such was his might & will power even as a child. Lord Indra was upset & strcuk Anjaneya with his thunderbolt (Vajraayudham). Vaayu Deva was upset that his son was struck & he stopped blowing. The whole world was in trouble without winds. All the Gods offered various powerful boons to Anjaneya, thus making him more powerful & invincble than before. Vayu Bhagavan was pleased & started his work again.
Anjaneya was causing trouble to the rishis & others, not really realising the might his powerful & playful actions. The angered rishis curesed him that he would cease to realise & recognise his powers unless someone remnded him of it. This calmed him down & he started his lessons with the rishis. He wanted to learn from Surya Bhagavan who is eternally travelling. The mighty Hanuman travelled with Surya at his speed and mastered all the scriptures. As Guru dakshina Anjaneya agreed to serve Sukriva, the son of Surya. He thus became a trusted and valued minister of Sugreeva, a monkey king.
He played a major role in the happenings in Ramayana, the great epic. When Rama was banished from his kingdom Ayodhya by his mother Kaikeyi, he reached the forests with his wife Sita & borther Lakshmana. Sugreeva with his army & Hanuman was in hiding from his brother Vaali. Hanuman met Rama & thereafter was with Rama forever. When Sita Devi was abducted by Ravana, the demon king, he flew across the oceans & found Sita Devi in the Ashoka vanam in Lanka. He consoled Sita Devi and set fire to Lanka, destorying many asuras. He served as the emissary of peace to Ravana's court. He assisted Rama in crossing the ocean by building the sethu bridge along with his vanara freinds. During the war he flew to bring the Sanjeevi mountain, full of medicinal herbs to revive Lakshmana who had fallen. When the victorious Rama returned to Ayodhya & was crowned king, he continued to serve him, ever at his service.
He featured in the other epic Mahabaratha. He stood by the Pandavas in the Kurukshetra war. He stabilised and protected Arjuna's chariot by being present in the flag flying in the chariot. He was thus honoured with witnessing the Geetopadhesam firsthand.

A simple prayer to Anjaneya
Asaathya Saadhaka Swaamin
Asaathyam Thavakim vadha
Raama Dhootha Kribhaa Sindho
Math Kaaryam Sadhakka Prabho