Introduction:
The Indian Sales of Goods Act, 1930, replaced Chapter 7 of the Indian Contract Act, 1872, to accommodate the evolving landscape of trade and commerce. It draws heavily from the English Sale of Goods Act, 1893, reflecting the changes in commercial practices. The Act regulates contracts of sale and purchase of goods in India.

Distinction between Agreement to Sale and Contract of Sale:
In a contract of sale, the property in goods transfers immediately from the seller to the buyer. Conversely, in an agreement to sell, the property transfers at a future date upon fulfillment of conditions specified in the agreement.

Contract of Sale and Contract of Work:
While the contract of sale focuses on the immediate transfer of property and delivery of possession, a contract of work centers on the provision of services and labor rather than the transfer of property.

Definition of Contract of Sale and Essential Elements:
Section 4 of the Sales of Goods Act defines a contract of sale as a contract where the seller transfers or agrees to transfer the property in goods to the buyer for a price. Essential elements include:
1. Two parties: seller and buyer.
2. Subject matter: goods.
3. Transfer of property or ownership of goods from seller to buyer.
4. Consideration, usually in the form of a price.

Bilateral Contract:
A contract of sale is bilateral, involving both a seller and a buyer. It necessitates the transfer of property from one party to another. The parties involved must be distinct individuals; otherwise, it may not constitute a sale.

Contract under Statutory Compulsion:
Sometimes, contracts may be entered into under statutory compulsion, wherein the consent is not influenced by fraud, misrepresentation, or mistake. Such contracts are still considered contracts of sale under the Sales of Goods Act.

Goods:
Goods encompass every kind of movable property except actionable claims and money. This includes stocks, growing crops, and even lottery tickets, as held in the case of H Anuj Anuraj v. Government of Tamil Nadu. Goods may also include things attached to or forming part of the land if agreed to be severed under the contract of sale.

Case Laws:
1. State of Gujarat vs. Ramlal Sons and Co: This case highlighted that a person cannot buy their own goods. The partners of a dissolved firm were considered joint owners of the goods and could not be both seller and buyer.
2. Andhra Sugar Limited vs. State of Andhra Pradesh: Here, the Supreme Court ruled that contracts entered into under statutory compulsion still constitute contracts of sale, provided they meet the criteria outlined in the Sales of Goods Act.
3. H Anuj Anuraj vs. Government of Tamil Nadu: This case determined that sale of lottery tickets qualifies as a sale of goods.

Conclusion:

In conclusion, a contract of sale involves the transfer of property in goods from seller to buyer for a price, with essential elements including two parties, goods, transfer of property, and consideration. Understanding the nuances of contract law, including relevant case laws, is crucial for parties engaged in commercial transactions.