What is the largest component found inside a field?

Largest component found inside a field is characters.

Explanation:  

Bits will be represented in binary form. It is the smallest element and it should be zero or one (0 or 1).  Characters are batch of bits. Eight bits are termed one byte (8 bits=1 byte) which is also called character. It is considered as largest component inside the field.

Field is a part of a table, it contains a group of characters which found as the largest component inside it. Data field represents different attributes like number, name, place, and event.