The Harappan (Indus Valley) Civilization, flourishing from approximately 2500 to 1900 BCE, was characterized by sophisticated urban planning, advanced craftsmanship, and a complex socio-economic structure. Trade and religion were two fundamental pillars that underpinned its existence and expansion.

Trade:

1. Extensive Network: The Harappans engaged in both internal and external trade. Internally, goods moved between different Harappan cities and rural settlements. Externally, they maintained robust trade relations with contemporary civilizations, most notably Mesopotamia (Sumer and Akkad), but also with regions like Oman, Bahrain, and Central Asia.

2. Traded Goods:

   • Exports: Finished goods like carnelian beads, shell and ivory products, cotton textiles, and possibly timber and agricultural produce. Harappan seals, found in Mesopotamia, suggest their involvement in long-distance trade.
   • Imports: Raw materials were crucial for Harappan industries. They imported copper from Rajasthan (Khetri mines) and Oman, gold from South India and Afghanistan, silver from Afghanistan and Persia, lapis lazuli from Afghanistan, turquoise from Persia, and various precious stones (like carnelian, agate, jasper) from Gujarat and other regions.

3. Trade Mechanisms:

   • Transportation: Goods were transported by bullock carts over land and by boats and ships along rivers and sea routes. Evidence of a dockyard at Lothal indicates maritime trade.
   • Standardization: The presence of standardized weights and measures (in binary and decimal systems) across the civilization facilitated fair trade. The distinctive Harappan seals, often depicting animals and undeciphered script, likely served as markers of ownership, authentication of goods, or as amulets for traders.
   • Colonies/Outposts: The discovery of Harappan sites like Shortughai in Afghanistan suggests trading outposts established to secure access to valuable resources like lapis lazuli.

Religion:

While the Harappan script remains undeciphered, archaeological evidence provides insights into their religious beliefs and practices, which appear to be polytheistic and centered around fertility, nature, and possibly a proto-Shiva figure.

1. Mother Goddess Worship: Numerous terracotta figurines of heavily adorned female figures, often with prominent breasts and hips, have been found. These are widely interpreted as representations of a Mother Goddess, symbolizing fertility, creation, and abundance, suggesting a strong matriarchal or matrifocal element in their religious practices.

2. Proto-Shiva (Pashupati Seal): A famous seal from Mohenjo-Daro depicts a horned figure seated in a yogic posture, surrounded by animals (elephant, tiger, rhinoceros, buffalo, and two deer below). This figure is often identified as 'Proto-Shiva' or 'Pashupati' (Lord of Animals), suggesting an early form of a deity resembling the later Hindu god Shiva, particularly in his aspect as a yogi and master of animals.

3. Nature Worship: The reverence for animals (bull, unicorn-like creature, tiger) depicted on seals, and the presence of sacred trees (like the Pipal tree) on seals and pottery, indicate a strong connection to and worship of nature. Animal sacrifices might have been part of their rituals.

4. Phallic and Yoni Worship: The discovery of conical and ring-shaped stones, often interpreted as lingams (phallic symbols) and yonis (vulva symbols), suggests the worship of male and female generative principles, associated with fertility and creation, similar to later Shaivism.

5. Ritual Bathing: The Great Bath at Mohenjo-Daro, a large public water tank, is believed to have served ritualistic purposes, possibly for purification ceremonies, indicating the importance of water in their religious practices.

6. Absence of Temples: Unlike contemporary civilizations like Mesopotamia and Egypt, no large monumental temples or specific structures unequivocally identified as places of worship have been found in Harappan cities. Religious practices seem to have been more domestic or communal, possibly involving open-air altars or sacred groves.

In essence, Harappan trade fostered economic prosperity and cultural exchange, while their religion, deeply intertwined with nature and fertility, laid some foundational elements for later Indian religious traditions, particularly Hinduism.