Hardware & Components / Knowledge library

RTC — Real-Time Clock

Keeps system time while the main system is off.

Acronym study batch 1 · reviewed 2026-10-20

Why learn RTC — Real-Time Clock?

Keeps system time while the main system is off.

Where it came from

Time drift can affect certificate and authentication checks.

• Memory aid (a learning cue, not the expansion): Real Time Continues while the laptop sleeps.

Build your understanding

Work through these exercises in order. Try the task before opening a reference.

1. Without looking, expand RTC: Real-Time Clock.
2. Recall this memory aid: Real Time Continues while the laptop sleeps.
3. Explain the practical use: Keeps system time while the main system is off.
4. Explain this distinction: Time drift can affect certificate and authentication checks.
5. Identify RTC in a device specification, architecture diagram, or system inventory.

Documentation and sources

• UEFI specifications (uefi.org)
• Microsoft TPM overview (learn.microsoft.com)

Catalog source: technology-maxxing. This page reproduces the existing catalog’s learning material and source links.