COntext

### Context in Programming or IT Systems In programming and IT systems, context refers to the environment and conditions under which certain operations are performed. This concept encompasses several aspects depending on the specific area within computing: #### Execution Context Execution context pertains specifically to how code executes at runtime. Each function call creates its own execution context that includes variables, scope chain, and this binding[^1]. For instance, when discussing JavaScript, each time a script starts running or enters a new function, an execution context is created. #### Thread Context Thread context involves all information associated with a particular thread's state including registers, stack pointers, program counter, etc.[^3]. When switching between threads, saving and restoring these contexts ensures continuity of operation without data loss or corruption. #### Security Context Security context defines what actions can be taken by processes based on their permissions level. It plays a critical role in determining access control policies applied to resources like files, network connections, hardware devices, among others. #### Application Context Application context represents settings relevant to applications such as configuration parameters, user preferences, session states, etc., ensuring consistent behavior across different parts of software while maintaining isolation from other programs sharing similar environments. ```python def example_function(): # An execution context is formed here containing local variable definitions, # parameter bindings, parent scopes references (scope chain), along with 'this' value. pass ```