The Rigveda represents the earliest sacred book of India. It is the oldest and biggest of all the four Vedas. All the features of Classical Sanskrit poetry can be traced to Rigveda. In it, we find the seeds of India’s religious and philosophical development. Thus, both for its poetry and its religious and philosophical importance, the Rigveda should be studied by one who wants to understand Indian literature and spiritual culture. The value of the Rigveda today is not confined to India, for its well-preserved language and mythology have helped a better understanding of languages, literature, and cultures of a whole world. The Samhita of the Rigveda comprises 10 Mandalas, 85 Anuvakas, 1028 Suktas and 10552  Mantras. Among 1028 Suktas of the Rigveda Samhita some suktas are very popular and frequently referred to by the readers of Vedas. Some of them are: 

1. Purusha Sukta 
2. Hiranya-garbha Sukta 
3. Dhana-anna-dana Sukta 
4. Aksha Sukta 
5. Nasadiya Sukta 
6. Duhsvapna-nashna Sukta
7. Yama-yami-samvada Sukta 

Besides, there are Suktas offered to different deities, such as Indra, Maruta,  Varuna, Usha, Surya, Bhumi, Soma, Agni, etc. Thus we can briefly say about the contents of Rigveda that it has various subjects, which are narrated by Vedic seers poetically, philosophically, or religiously.