Glossary
Every term the courses use, defined in one line and then in a paragraph. Written to be read out of order.
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The amount of data being sent.
The size of what travels over the network. One of four unrelated kinds of slow, and the one that gets dramatically worse on mobile connections.
Shown, but not yet confirmed.
The honest middle ground for an optimistic update: display the change immediately, but mark it as unconfirmed. A failure then becomes a change of state rather than a contradiction.
See also Optimistic update, Loading state
Which program on a machine you are talking to.
A number that lets one machine run many servers at once. The address finds the machine, the port finds the program: a web app on 3000, a database on 5432.
A written account of an incident, without blame.
What happened, what the impact was, and what allowed it to reach users. The useful question is never who did it but which missing check would have caught it.
A temporary live copy of a proposed change.
A working URL for a change before it is accepted, so it can be clicked rather than described. Also means the deploy path is exercised constantly rather than only when it is scary.
See also Environment, CI/CD
The column that uniquely identifies a row.
The one value that picks out exactly one row in a table. Other tables refer to a row by holding its primary key, which is how relationships are built.
See also Foreign key, Table
A running program.
One instance of your code, executing. A server is a process that is listening; when it exits, the server is gone even though the machine is still on.
Reusing an unchanged prefix across calls.
When the same large preamble is sent on every request, providers often charge a reduced rate for the repeated part. One of the cheapest available reductions in model cost.
See also Token (model), Context window
Hostile instructions hidden in content a model reads.
A web page, email or uploaded file containing text aimed at the model rather than the reader. There is no reliable filter, because instructions and data arrive through the same channel. Limit what the agent can do instead.
See also Agent, Blast radius, Tool use