bulkified means Ensure that your code can properly process more than one record at a time. Links https://developer.salesforce.com/page/Best_Practice%3A_Bulkify_Your_Code https://help.salesforce.com/articleView?id=vpm_admin_bulkification.htm&type=5 https://trailhead.salesforce.com/en/modules/apex_triggers/units/apex_triggers_bulk
Links
https://developer.salesforce.com/page/Best_Practice%3A_Bulkify_Your_Code
https://help.salesforce.com/articleView?id=vpm_admin_bulkification.htm&type=5
https://trailhead.salesforce.com/en/modules/apex_triggers/units/apex_triggers_bulk
Process builder or workflow both are bulkified