You have several elected representatives at different levels of government.
Your 2 Hatfield Central district councillors represent you on Welwyn Hatfield Borough Council. The District Council is responsible for local services, including planning, council housing, and rubbish collection. Most district councillors are not paid a salary, but get a basic allowance for the work they do.
Your Hatfield North county councillor represents you on Hertfordshire County Council. The County Council is responsible for local services, including education, social services, transport, roads (except trunk roads and motorways), public rights of way, and libraries. Most county councillors are not paid a salary, but get a basic allowance for the work they do.
Your Welwyn Hatfield MP represents you in the House of Commons. The House of Commons is responsible for making laws in the UK and for overall scrutiny of all aspects of government.