What is L1 L2 and L3 support in It?

L1, L2, and L3 support refer to different levels of technical support in IT services. L1 (Level 1) support is the first line of contact, handling basic issues and general queries, typically through a help desk. L2 (Level 2) support deals with more complex problems that require specialized knowledge, often involving troubleshooting and technical expertise. L3 (Level 3) support consists of the highest level of technical support, usually involving experts or engineers who resolve the most challenging and critical issues that L1 and L2 cannot handle.