# Concerning "bits of precision"

I am a newcomer to Sage. I learn Sage to compute Gröbner bases.

Concerning polynomial ring, if I type:

```
R = PolynomialRing(QQ, 't')
R
```

I get:

```
Univariate Polynomial Ring in t over Rational Field
```

But if I type:

```
R = PolynomialRing(RR, 't')
R
```

I get:

```
Univariate Polynomial Ring in t over Real Field with 53 bits of precision
```

What does "with 53 bits of precision" mean? If I don't know its meaning, will it matter when I compute Gröbner bases? I would appreciate any help with this situation.