The content of a univariate integer polynomial is the GCD of its coefficients.
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$\mathrm{content}\left(33x\,x\right)$

The content of a multivariate polynomial a with respect to some of its variable(s) x is the GCD of its coefficients, considering a as a polynomial in the variable(s) x with any remaining variables being part of the coefficient ring. In the example below, a is viewed as a polynomial in x with coefficients that are polynomials in y. The example after that takes the same polynomial, but views it as a multivariate polynomial in x and y with integer coefficients.
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$\mathrm{content}\left(3xy\+6{y}^{2}\,x\right)$

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$\mathrm{content}\left(3xy\+6{y}^{2}\,\left[x\,y\right]\right)$

The following example computes not just the content, but also the primitive part.
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$\mathrm{content}\left(4xy\+6{y}^{2}\,x\,\'\mathrm{pp}\'\right)$

${3}{}{y}{}{2}{}{x}$
 (5) 
In this example, you can see the effect of calling normal, which happens because the polynomial doesn't have purely numeric coefficients (the coefficient of x is $\frac{1}{a}$).
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$\mathrm{content}\left(\frac{x}{a}\frac{1}{2}\,x\,\'\mathrm{pp}\'\right)$

$\frac{{1}}{{2}{}{a}}$
 (6) 
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$\mathrm{normal}\left(\frac{x}{a}\frac{1}{2}\right)$

${}\frac{{}{2}{}{x}{+}{a}}{{2}{}{a}}$
 (8) 
Alternatively, if a is included as an indeterminate, the denominator $\frac{1}{a}$ is included in the primpart rather than the content:
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$\mathrm{content}\left(\frac{x}{a}\frac{1}{2}\,\left\{x\,a\right\}\,\'\mathrm{pp}\'\right)$

$\frac{{2}{}{x}{}{a}}{{a}}$
 (10) 
Floating point coefficients are considered indivisible with respect to each other  even if they are equal. As a consequence, the content in the following example is 1.
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$\mathrm{content}\left(2.ux2.v\,x\,\'\mathrm{pp}\'\right)$

${2.}{}{u}{}{x}{}{2.}{}{v}$
 (12) 
In the presence of floatingpoint numbers, other content is still detected. For example, the factor u below.
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$\mathrm{content}\left(2.ux2.u\,x\,\'\mathrm{pp}\'\right)$

Nonnumeric, nonpolynomial coefficients are also considered indivisible with respect to each other. For example, you could consider $\sqrt{2}$ to be a common divisor between the two coefficients $\sqrt{10}$ and $\sqrt{6}$, but they are considered indivisible with respect to each other for this command and the content is considered to be 1.
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$\mathrm{content}\left(\sqrt{10}x\+\sqrt{6}\,x\right)$

The primpart command computes just the primitive part of the expression.
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$\mathrm{primpart}\left(4xy\+6{y}^{2}\,x\right)$

${3}{}{y}{}{2}{}{x}$
 (16) 
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$\mathrm{primpart}\left(\frac{x}{a}\frac{1}{2}\,x\right)$
