"Con offer" refers to a conditional offer, which means there are certain conditions that need to be met in order for the offer to be valid. These conditions could include things like passing a background check or providing additional documentation.

On the other hand, a "full offer" is an unconditional offer, meaning there are no conditions attached to it. Once the offer is made, it is immediately valid and does not require any further actions or qualifications.

In summary, the main difference between a con offer and a full offer is that con offer has conditions that need to be fulfilled, while a full offer is immediate and does not have any conditions.