What is the difference between a PCI and ISA slot?

In this image, you can see, from the right, a 16-bit ISA slot , an 8-bit ISA slot, four more 16-bit ISA slots,

ISA is a standard bus architecture that was associated with the IBM AT motherboard

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isa slot FORM : NAME ALS - DREAM - APT TYPE PATTERN : ISA APARTMENT : WITH ( ( STREET slot filled with a predicate FORMS - COMPATIBLE