It's only an entire fictional character and their lives, families and motives.
If you want to play DND, the first thing you will need to do is create a character, and the most importatnt part of that is deciding who this person is and what they stand for. Usually this is done through the alignment chart (right image), personality traits, ideals, bonds, and flaws. The alignment chart holds 5 things nuteral, chaotic, lawful, good, and evil. They all usually make sense when put togeather. Chaotic people tend to not think, evil people tend to hurt other people, and Lawful Evil refers to theives or people who have a moral code, but don't obey the law. A personality trait is some unique quirk like "I use a multitude of gigantigantic made up words to sound smart". An Ideal is something they belive in, like "I'm loyal to my friends, and only my friends." A bond is something that is important to them, like how their sword is a family heirloom. Lastly, a flaw is like a secret they have, or a bad personality trait like greed. Below is a compilation of these for all four of the premade characters that come with the Lost Mines of Phandelver to help inspire you.
Human Fighter
Lawful Nuteral
Personality Traits: My flattery makes those I talk to feel
wonderful and important. Also, I don’t like
to get dirty, and I won’t be caught dead in
unsuitable accommodations.
Ideals: Responsibility. It’s the duty of a noble
to protect the common people, not
bully them
Bonds: My greataxe is a family heirloom, and it’s
by far my most precious possession.
Flaws: I have a hard time resisting the allure of
wealth, especially gold. Wealth can help me
restore my legacy
Halfling Rogue
True Nuteral
Personality Traits: I never have a plan, but I’m great at
making things up as I go along. Also, the
best way to get me to do something is to
tell me I can’t do it.
Ideals: People. I’m loyal to my friends, not to any
ideals. Everyone else can take a trip on the
River Styx for all I care.
Bonds: Qelline Alderlead, my aunt, has a farm in
Phandalin. I always give her some of my
ill-gotten gains.
Flaws: My aunt must never know the deeds I did
as a member of the Redbrands
Dwarf Cleric
Nuteral Good
Personality Traits: I’m always polite and respectful. Also, I
don’t trust my gut feelings, so I tend to
wait for others to act.
Ideals: Respect. People deserve to be treated with
dignity and courtesy.
Bonds: I have three cousins—Gundren, Tharden,
and Nundro Rockseeker—who are my
friends and cherished clan members.
Flaws: I secretly wonder whether the gods care
about mortal affairs at all.
High Elf Wizard
Chaotic Good
Personality Traits: I use polysyllabic words that convey the
impression of erudition. Also, I’ve spent
so long in the temple that I have little
experience dealing with people on a
casual basis.
Ideals: Knowledge. The path to power and selfimprovement is through knowledge.
Bonds: The tome I carry with me is the record of
my life’s work so far, and no vault is secure
enough to keep it safe.
Flaws: I’ll do just about anything to uncover
historical secrets that would add to
my research.