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The words, before the rules.
You do not need a programming or security background. Each part defines a word before it depends on it.
Software is a set of instructions a computer runs. An application is software used for a purpose, such as email. Data is the information that software handles. A service is software that answers requests from other software. A server is a computer, or a program, that supplies a service.
Artificial intelligence, here, means software that generates language, recognizes patterns, or selects actions. An AI model is built by training on examples. Training adjusts internal values so the model can produce useful output. It learns patterns. It does not receive a handwritten rule for every input.
A large language model generates text from those patterns and from the current input. Convincing text is not a checked fact. The model can be wrong, follow a misleading instruction, or propose an action that should not happen.