The term static differentiates SRAM from DRAM (dynamic random-access memory) which must be periodically refreshed. SRAM is faster and more expensive than DRAM; it is typically used for CPU cache while DRAM is used for a computer's main memory. 1 Applications and uses 1.1 Characteristics 1.1.1 Clock rate and power.
A biological key is a list of questions that can categorize the items.
Definition of key for English Language Learners : to enter (information) by using the keys of a computer, typewriter, etc. : to have the most important part in (something)