For the purposes of the Transfer of Property Act, 1882, the difference between charge and mortgage is…

A mortgage under section 58 of the Transfer of Property Act is a transfer of an interest in specific immovable property as security, whereas a charge under section 100 only makes the property security for payment without transferring any interest; so "charge is not transfer of interest whereas mortgage is transfer of interest". A charge under section 100 is created over immovable property and is governed by the Transfer of Property Act, not the Sale of Goods Act, and charges can arise by act of parties or by operation of law, so they are not distinguished by lack of consideration.