SNOW

Inbound means that other applications make calls to ServiceNow's REST API to get information from SN ,   basically when some other tool hits your instance(wsdl) with a payload and you process it and acknowledge it. EG, if an incident gets created in a third party tool then an incident gets created in a service now . Here we accept the request and process it. - Direct Web Services - Web Service Import Sets -Direct Web Service API : Servicenow by default creates a webservice api for every table in the system, if you create a custom table system will provide SOAP and REST api to perform CURD operations. - Web Service Import Sets Staging web-service/Web Service Import Sets: this staging allow third party to send data to import table and then we do transform map by qualifying the data to send into the Servicenow.

BEFORE : Use before insert/update business rule to do some validation and if validation fails stop form submission Use before insert/update business rule to set values for current record based on some other fields on the form such as calculated field AFTER : Use after insert/update business rule to insert/update data in related list table Use to update information on related objects that need to be displayed immediately, such as GlideRecord queries. ASYNC: Use to update information on related objects that do not need to be displayed immediately, such as calculating metrics and SLAs. Mostly used to call 3rd party SOAP or REST endpoints DISPLAY : Mostly used to send field value from server side to client side; for the fields which are not available on the form, this value can be used in onload, onchange, onsubmit client scripts