Answer 1

In a linked list, you have a serie of dynamically-created nodes where each holds a value (possibly several) and a pointer to the next node (+ a pointer to the previous node in the case of doubly linked lists). You can't access to a value directly like in an array, you have to browse the list for that, following the pointers one after another.

Here is an example:
http://code.sololearn.com/c3L7mCPF94GB