This document discusses different types of offers in contract law. It defines a counter offer as rejecting the original offer and making a new offer, using the example of A offering to sell their house to B for Rs. 2 lakhs, but B counters with Rs. 1 lakh. This counter offer rejects the original and creates a new offer, so if B changes their mind later, they cannot accept the original Rs. 2 lakh offer as it has lapsed. The document also discusses cross offers, where two parties simultaneously make identical offers to each other without knowledge of the other's offer, and explains that cross offers alone do not constitute acceptance.