diff --git a/.zk/notebook.db b/.zk/notebook.db
index 777e687..ffcf450 100644
Binary files a/.zk/notebook.db and b/.zk/notebook.db differ
diff --git a/zk/Hexadecimal_number_system.md b/zk/Hexadecimal_number_system.md
index 0d340e7..5dc69db 100644
--- a/zk/Hexadecimal_number_system.md
+++ b/zk/Hexadecimal_number_system.md
@@ -1,7 +1,6 @@
 ---
 tags:
   - number-systems
-  - hardware
   - computer-architecture
 ---
 
diff --git a/zk/Link_Layer_of_Internet_Protocol.md b/zk/Link_Layer_of_Internet_Protocol.md
index 4610a17..f996e23 100644
--- a/zk/Link_Layer_of_Internet_Protocol.md
+++ b/zk/Link_Layer_of_Internet_Protocol.md
@@ -1,6 +1,6 @@
 ---
 title: Link_Layer_of_the_Internet_Protocol
-tags: []
+tags: [networks, internet]
 created: Tuesday, August 06, 2024
 ---
 
diff --git a/zk/MAC_addresses.md b/zk/MAC_addresses.md
index 4fd85ad..2c2a822 100644
--- a/zk/MAC_addresses.md
+++ b/zk/MAC_addresses.md
@@ -10,9 +10,9 @@ A Media Access Control (MAC) address is a physical address in contrast to, say,
 an IP address which is logical.
 
 Each device on a [local network](./Link_Layer_of_Internet_Protocol.md) has a MAC
-as a unique identifier. It is hardware-based and the addresses are typically
-burned into the network card by the manufacturer, making them a physical
-attribute of the device.
+as a unique identifier. It is a hardware-based, physical attribute of the
+device, typically permanently encoded onto a non-volatile memory chip attached
+to the network card.
 
 MAC addresses consist of 6 bytes (48-bits) represented as 12
-[hexadecimal_digits](Hexadecimal_number_system.md)
+[hexadecimal_digits](Hexadecimal_number_system.md).
diff --git a/zk/Network_card.md b/zk/Network_card.md
new file mode 100644
index 0000000..908b863
--- /dev/null
+++ b/zk/Network_card.md
@@ -0,0 +1,24 @@
+---
+title: Network_card
+tags: [networks, hardware]
+created: Tuesday, August 06, 2024
+---
+
+# Network_card
+
+The network card (technically know as the Network Interface Card (NIC)) or
+_network adapter_ is the hardware device that allows a computer to connect to a
+network.
+
+They are the physical interface between the computer and the network
+[link](./Link_Layer_of_Internet_Protocol.md), e.g. WiFi or ethernet.
+
+They can be internal and built into the [motherboard](./Motherboard.md) or
+external as in the case of USB adaptors.
+
+Each network card has a unique [MAC address](./MAC_addresses.md) to identify the
+device on the network.
+
+Network cards on consumer-grade devices typically utilise the devices resources
+and the kernel manages its actions via a driver. More high-end devices
+(typically used in servers) have their own processors and memory.
diff --git a/zk/Signed_and_unsigned_numbers.md b/zk/Signed_and_unsigned_numbers.md
index d0922df..f200839 100644
--- a/zk/Signed_and_unsigned_numbers.md
+++ b/zk/Signed_and_unsigned_numbers.md
@@ -1,7 +1,6 @@
 ---
 tags:
   - binary
-  - hardware
 ---
 
 # Signed and unsigned numbers
diff --git a/zk/Twos_complement.md b/zk/Twos_complement.md
index bbfa632..a87d7eb 100644
--- a/zk/Twos_complement.md
+++ b/zk/Twos_complement.md
@@ -3,7 +3,6 @@ id: gktb
 title: Two's complement
 tags:
   - binary
-  - hardware
 created: Tuesday, March 19, 2024
 ---