Transferable skills are skills and abilities you take with you from role to role.
They are both Hard and Soft skills. For example, you may have used a particular programme on a computer in one job, which means you have developed computer skills. These are transferable.
Some other examples of transferable skills are; Communication. In one role, you may have to answer telephone calls and emails from customers; you have developed written and spoken communication skills; In another position, you could have measured and cut lengths of wood for customers to buy and ordered more when you ran out. This means you have developed monitoring and checking skills.