ASCII（American Standard Code for Information Interchange，美国信息互换标准代码）是一套基于拉丁字母的字符编码，共收录了 128 个字符，用一个字节就可以存储，它等同于国际标准 ISO/IEC 646。
ASCII 编码于 1967 年第一次发布，最后一次更新是在 1986 年，迄今为止共收录了 128 个字符，包含了基本的拉丁字母（英文字母）、阿拉伯数字（也就是 1234567890）、标点符号（,.!等）、特殊符号（@#$%^&等）以及一些具有控制功能的字符（往往不会显示出来）。
| 二进制 | 十进制 | 十六进制 | 字符/缩写 | 解释 |
|---|---|---|---|---|
| 0 | 0 | 0 | NUL (NULL) | 空字符 |
| 1 | 1 | 1 | SOH (Start Of Headling) | 标题开始 |
| 10 | 2 | 2 | STX (Start Of Text) | 正文开始 |
| 11 | 3 | 3 | ETX (End Of Text) | 正文结束 |
| 100 | 4 | 4 | EOT (End Of Transmission) | 传输结束 |
| 101 | 5 | 5 | ENQ (Enquiry) | 请求 |
| 110 | 6 | 6 | ACK (Acknowledge) | 回应/响应/收到通知 |
| 111 | 7 | 7 | BEL (Bell) | 响铃 |
| 1000 | 8 | 8 | BS (Backspace) | 退格 |
| 1001 | 9 | 9 | HT (Horizontal Tab) | 水平制表符 |
| 1010 | 10 | 0A | LF/NL(Line Feed/New Line) | 换行键 |
| 1011 | 11 | 0B | VT (Vertical Tab) | 垂直制表符 |
| 1100 | 12 | 0C | FF/NP (Form Feed/New Page) | 换页键 |
| 1101 | 13 | 0D | CR (Carriage Return) | 回车键 |
| 1110 | 14 | 0E | SO (Shift Out) | 不用切换 |
| 1111 | 15 | 0F | SI (Shift In) | 启用切换 |
| 10000 | 16 | 10 | DLE (Data Link Escape) | 数据链路转义 |
| 10001 | 17 | 11 | DC1/XON | 设备控制1/传输开始 |
| (Device Control 1/Transmission On) | ||||
| 10010 | 18 | 12 | DC2 (Device Control 2) | 设备控制2 |
| 10011 | 19 | 13 | DC3/XOFF | 设备控制3/传输中断 |
| (Device Control 3/Transmission Off) | ||||
| 10100 | 20 | 14 | DC4 (Device Control 4) | 设备控制4 |
| 10101 | 21 | 15 | NAK (Negative Acknowledge) | 无响应/非正常响应/拒绝接收 |
| 10110 | 22 | 16 | SYN (Synchronous Idle) | 同步空闲 |
| 10111 | 23 | 17 | ETB (End of Transmission Block) | 传输块结束/块传输终止 |
| 11000 | 24 | 18 | CAN (Cancel) | 取消 |
| 11001 | 25 | 19 | EM (End of Medium) | 已到介质末端/介质存储已满/介质中断 |
| 11010 | 26 | 1A | SUB (Substitute) | 替补/替换 |
| 11011 | 27 | 1B | ESC (Escape) | 逃离/取消 |
| 11100 | 28 | 1C | FS (File Separator) | 文件分割符 |
| 11101 | 29 | 1D | GS (Group Separator) | 组分隔符/分组符 |
| 11110 | 30 | 1E | RS (Record Separator) | 记录分离符 |
| 11111 | 31 | 1F | US (Unit Separator) | 单元分隔符 |
| 100000 | 32 | 20 | (Space) | 空格 |
| 100001 | 33 | 21 | ! | |
| 100010 | 34 | 22 | “””” | |
| 100011 | 35 | 23 | # | |
| 100100 | 36 | 24 | $ | |
| 100101 | 37 | 25 | % | |
| 100110 | 38 | 26 | & | |
| 100111 | 39 | 27 | ‘ | |
| 101000 | 40 | 28 | ( | |
| 101001 | 41 | 29 | ) | |
| 101010 | 42 | 2A | * | |
| 101011 | 43 | 2B | + | |
| 101100 | 44 | 2C | , | |
| 101101 | 45 | 2D | - | |
| 101110 | 46 | 2E | . | |
| 101111 | 47 | 2F | / | |
| 110000 | 48 | 30 | 0 | |
| 110001 | 49 | 31 | 1 | |
| 110010 | 50 | 32 | 2 | |
| 110011 | 51 | 33 | 3 | |
| 110100 | 52 | 34 | 4 | |
| 110101 | 53 | 35 | 5 | |
| 110110 | 54 | 36 | 6 | |
| 110111 | 55 | 37 | 7 | |
| 111000 | 56 | 38 | 8 | |
| 111001 | 57 | 39 | 9 | |
| 111010 | 58 | 3A | : | |
| 111011 | 59 | 3B | ; | |
| 111100 | 60 | 3C | < | |
| 111101 | 61 | 3D | = | |
| 111110 | 62 | 3E | > | |
| 111111 | 63 | 3F | ? | |
| 1000000 | 64 | 40 | @ | |
| 1000001 | 65 | 41 | A | |
| 1000010 | 66 | 42 | B | |
| 1000011 | 67 | 43 | C | |
| 1000100 | 68 | 44 | D | |
| 1000101 | 69 | 45 | E | |
| 1000110 | 70 | 46 | F | |
| 1000111 | 71 | 47 | G | |
| 1001000 | 72 | 48 | H | |
| 1001001 | 73 | 49 | I | |
| 1001010 | 74 | 4A | J | |
| 1001011 | 75 | 4B | K | |
| 1001100 | 76 | 4C | L | |
| 1001101 | 77 | 4D | M | |
| 1001110 | 78 | 4E | N | |
| 1001111 | 79 | 4F | O | |
| 1010000 | 80 | 50 | P | |
| 1010001 | 81 | 51 | Q | |
| 1010010 | 82 | 52 | R | |
| 1010011 | 83 | 53 | S | |
| 1010100 | 84 | 54 | T | |
| 1010101 | 85 | 55 | U | |
| 1010110 | 86 | 56 | V | |
| 1010111 | 87 | 57 | W | |
| 1011000 | 88 | 58 | X | |
| 1011001 | 89 | 59 | Y | |
| 1011010 | 90 | 5A | Z | |
| 1011011 | 91 | 5B | [ | |
| 1011100 | 92 | 5C | \ | |
| 1011101 | 93 | 5D | ] | |
| 1011110 | 94 | 5E | ^ | |
| 1011111 | 95 | 5F | _ | |
| 1100000 | 96 | 60 | ` | |
| 1100001 | 97 | 61 | a | |
| 1100010 | 98 | 62 | b | |
| 1100011 | 99 | 63 | c | |
| 1100100 | 100 | 64 | d | |
| 1100101 | 101 | 65 | e | |
| 1100110 | 102 | 66 | f | |
| 1100111 | 103 | 67 | g | |
| 1101000 | 104 | 68 | h | |
| 1101001 | 105 | 69 | i | |
| 1101010 | 106 | 6A | j | |
| 1101011 | 107 | 6B | k | |
| 1101100 | 108 | 6C | l | |
| 1101101 | 109 | 6D | m | |
| 1101110 | 110 | 6E | n | |
| 1101111 | 111 | 6F | o | |
| 1110000 | 112 | 70 | p | |
| 1110001 | 113 | 71 | q | |
| 1110010 | 114 | 72 | r | |
| 1110011 | 115 | 73 | s | |
| 1110100 | 116 | 74 | t | |
| 1110101 | 117 | 75 | u | |
| 1110110 | 118 | 76 | v | |
| 1110111 | 119 | 77 | w | |
| 1111000 | 120 | 78 | x | |
| 1111001 | 121 | 79 | y | |
| 1111010 | 122 | 7A | z | |
| 1111011 | 123 | 7B | { | |
| 1111100 | 124 | 7C | ||
| 1111101 | 125 | 7D | } | |
| 1111110 | 126 | 7E | ~ | |
| 1111111 | 127 | 7F | DEL (Delete) | 删除 |
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