Cycle time :
A factory that make dim sum for resturant, the dim sum has a production process, from the start of production to the ready of the food, how long time to complete it ? The no. of days is the cycle time.
So, you may consider its the time of the process from beginning to end of doing something.
Lead time :
A customer order for the product --> Factory get order entry into system --> prepare material to build the product (usually need to purchase something) --> production/manufacturering --> testing--> packing --> shiping --> customer.
How long time it take ? the no of days is the lead time ! (the days your customer need to wait ).
Some company keep stock, the lead time is shorter.
In a resturant, customer order a set lunch, he wait 10 minutes to get the set to eat. The lead time is 10 minutes law.
If you are concern,
Cycle time --> processing time
Lead time --> customer waiting time
Are they the same ? sometimes they are the same depends on your industry, your stock, and what part of the process you want to measure for cycle time.