Glossary and links | Copilot x Sectors

Starter kit

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Appendix

Glossary

Term	Meaning
Agent mode	The Copilot mode that builds: it creates and edits files, runs commands and tries again (2.3).
AI agent	An AI that plans and takes several steps on its own instead of only answering.
API	Application programming interface: a set way for one program to ask another for data (5.1).
API key	A secret code that identifies you to an API; each request with it may use credits (5.2).
Ask mode	The Copilot mode that answers and plans without changing files (2.3).
Backend	The part of an app that works out of sight: formulas, rules, fetching data, keeping secrets (3.3).
Bug	The app doing something wrong, from a crash to a wrong number.
Closing price	The price of one share at the end of a trading day.
Commit	A save point in Git, with a short message about what changed (8.1).
Context	Everything Copilot sees when it answers: your prompt, attached files, the chat so far.
Credits	The units Sectors counts API requests in.
Data	Where an app’s numbers come from: what you type, or an API (3.3).
Deploy	Copying your app to a server so it is live on the internet (9.1).
.env	A local file that holds secrets as `NAME=value` lines; never committed (5.3).
Framework	A ready-made starter kit of code; Streamlit is one.
Frontend	The part of an app you see and click (3.3).
Git	A free tool that keeps a history of your project as commits (8.1).
GitHub	A website that stores Git repositories online.
.gitignore	A list of files Git must never save (8.2).
Helper	A small file of ready-made functions; `sectors.py` is one (5.1).
Host	A service that stores, builds and serves your app (9.1).
IDE	Integrated development environment: a code editor with extra tools.
IDX	The Indonesia Stock Exchange.
JSON	A text format for data made of labelled values, such as `"sector": "Financials"`.
Localhost	Your own computer, as an address: `http://localhost:8501` for a Streamlit app.
Lot	The unit IDX shares are bought in: 100 shares.
Market cap	Market capitalisation: share price × number of shares, in rupiah.
MCP	Model Context Protocol: a standard plug that lets AI tools use outside services (10.1).
Native app	An app installed on one operating system, such as a phone app.
Plan → Implement → Test → Repeat	The four-step loop for building every feature (4.1).
Push	Uploading your commits to GitHub (8.5).
Repository (repo)	A project folder together with its full Git history.
requirements.txt	The list of Python packages an app needs; the host installs them.
Secret	A value that must not be shared, such as an API key or password.
Secrets (Streamlit)	Where a deployed app’s secrets live on Streamlit Community Cloud (9.3).
Server	A computer in a data centre that keeps an app running for everyone.
Stage	Choosing which changes go into the next commit (8.1).
Streamlit	A Python framework that turns a script into a web app.
Streamlit Community Cloud	Streamlit’s free host for public apps.
Terminal	A text window where you type commands.
Ticker	A stock’s short code on the exchange, such as BBCA or TLKM.
Volume	The number of shares traded in a day.
Web app	An app that runs in a browser and is opened with a link (3.2).