What is the difference between Gross and Net?

Gross means before any deductions

Net means after deductions

Gross and net are often used in describing leases

A gross lease is one where the the landlord receives his return in the form of rent before payment of any expenses; the tenant pays a fixed amount of rent per month.  The landlord then pays all the expenses of the property from his gross rent

A net lease is one where the landlord receives his return in the form of rent after payment of expenses; the tenant pays a fixed amount of rent per month AND an additional amount in respect of the expenses of the property (often termed a CAM payment in commercial leases).  The landlord then pays the expenses of the property from the contributions received from his tenants