Final answer:
All triggers run in User context by default in Salesforce. Triggers determine what data is accessible and what operations can be performed. They can be written in Apex or Visualforce.
Step-by-step explanation:
All triggers run in User context by default in Salesforce. This means that when a trigger is executed, it runs with the permissions and access rights of the user who caused the trigger to execute. The user context determines what data is accessible and what operations can be performed.
For example, if a trigger is written to update certain fields on a record when it is created, the trigger will use the access rights and permissions of the user who created that record. If the user does not have the appropriate permissions, the trigger may encounter errors or fail to execute.
Triggers can be written in either an Apex class or a Visualforce page, and they are used to automate processes and perform custom actions when certain events occur in Salesforce, such as record creation, deletion, or modification.