These are terms relevant for National Insurance contributions.
The point at which you start paying National Insurance contributions is the ‘Primary Threshold’. When you earn more than £9,880 (2022/23) per year, you contribute to your NI record.
The Lower Earnings Limit threshold for NICs in 2022/23 is £6,396 per year. Workers earning less than the Lower Earnings threshold don't pay NICs.
National Insurance contributions depend on a worker's earnings. If a worker earns more than £9,880 per year then they currently pay 13.25% of their earnings in NICs. Please note that these figures are subject to change per the Chancellors intention to increase NIC contribution on the back of the announcement on 23 March 2022.