The difference between a filter and a strainer

Usually when we talk about the production of filtration, often mention the filter or filter, customers are sometimes a little confused, in the end, what is called a more accurate name?

    Filter: For a long time, we usually think that "filter" is a kind of machinery that can complete part of the work independently, it should have moving parts, the structure is relatively complex, the filter is usually equipped with feed pipe, moving parts (various pumps, stirring parts, etc.), connecting fittings, valves, filter components, discharge valve, discharge parts, etc., the parts are installed together in accordance with certain requirements. Each accessory is installed together according to certain requirements, and the filtering work is completed by connecting the power supply or high pressure air source.